Questions tagged [electricity]

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Source for electricity in the times of the Talmud?

Many years ago I was told a story about an Amorah (Talmudic sage) who had an electric lamp, and when discovered said something along the lines of, the world isn't ready for this yet. I'm looking for ...
4
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1answer
102 views

Shutting lights off during Chol Ha'moed, to save electricity

Preface During Shabbat, Orthodox Jewish practice is to avoid turning lights on or off. Perhaps turning lights on or off is a form of melacha. On Chol Ha'moed, melacha is sometimes, but not always, ...
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0answers
30 views

When a power-vented hot water heater runs during Yom Tov, it triggers not just a flame, but also a blower fan motor. Is this okay?

You live in a house in North America with a 75-gallon power-vented gas-fired hot water heater. The house has no chimney, which is why the power-vent feature is useful. The instruction manual (PDF) ...
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65 views

Source that Power generators on Shabbos override Shlom Bayt (in Israel)

Power generators are very popular with Haredim in Israel that traditionally don't rely on Isral Electric Company's electricity on Shabbos. On Rosh Hashana, the power generator of a famous Yeshiva in ...
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0answers
51 views

Why is turning on a faucet not considered molid or boneh?

As has been discussed in many questions on this site, halachic authorities generally agree that the use of electricity is prohibited on Shabbat, but some differ in their analysis of why. (There is ...
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1answer
84 views

Is it permitted to turn off a time switch on Shabbos?

On a time switch (timer), there are generally two options: one which will ignore the time switch and let the current flow, and one which activates the timer. In the case where the switch is on the ...
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0answers
50 views

Shabbat: Electric Apartment Door in Doorman Building

Let us say a person lives in an apartment building where the apartment doors (door to the apartment itself) are fitted with electronic locks. The building has a 24-hour "concierge" doorman (non-...
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1answer
81 views

Dimmer Lights on Yom Tov

On Yom Tov, we are allowed to adjust fire (i.e. change the strength of the stove) so long as we do not completely turn the stove on or off. Therefore, if a room’s lighting has a dimmer switch, would ...
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1answer
83 views

Asking a non-Jew to turn off a light on Shabbat

If I would like to turn off a light on Shabbat can I ask a non-Jew to turn off the light since it's a shvut deshvut? (ie- electricity is a derabanan and amira lnochri is also shvut)
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1answer
326 views

Use of an automatic toilet on Shabbos?

Can one use on Shabbos an automatic toilet with an electric sensor that triggers the flushing mechanism when you are done? For example in a hotel lobby, or a public building. Assume there is no other ...
13
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1answer
124 views

Can a “brain controlled” prosthetic be used on Shabbat?

New prosthetics are controlled by brain waves which seem to make the prosthetic an extension of the body in an "organic" way, in that we control all of our own limbs through the same brain waves and ...
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50 views

Difference between Halperin and Tzomet switches?

I am reading about the various so-called Grama and other Shabbat switches developed in Israel for use in hospitals and security situations. It seems that there was one solution created by Rabbi ...
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1answer
454 views

Tweeting on Shabbat: d'oraita or d'rabbanan violation?

There was a dangerous situation in my community on Shabbat and I knew (from the amount my house phone was ringing and my cell phone was buzzing) that people I knew across the world would be concerned ...
5
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1answer
213 views

Reason for a Chanukah Minhag

Are there any authorities who suggest that the reason for the Minhag for women to avoid Melacha (creative work) while the Chanukah candles are lit is because we are worried they may come to use the ...
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2answers
68 views

Conductivity of living things and Shabbat

If electricity is banned on shabbat, how does a person deal with the problem of the body being a conductor? When I hold a person's hands, it creates a circuit. If I let go of their hands then I have ...
4
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1answer
196 views

Using modern electronic devices (refrigerators, air conditioners, digital water meters) on Shabbat

The Mishmereth Hashabbath institute in Israel has published a booklet which claims that using many modern electronic devices (refrigerators, air conditioners, digital water meters) are highly ...
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1answer
315 views

Being in a photo on Shabbos

If someone is taking a picture on Shabbos on their phone or a digital camera - must one try not to be in the picture; does he violate anything if he specifically “photo bombs” the pic on Shabbat? Does ...
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0answers
77 views

Light switch on Shabbat - no bulb, unplugging an extension cord

Muktza aside - Is it permissible on Shabbat to turn off a light switch if the light bulb burned out; Is there any issue in removing the current from the circuit 10, 15, 20 ft back? The same I would ...
6
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1answer
133 views

On Shabbos, may someone turn off a switch of an electric-eye controlled light while the light is off?

If a room or an area has an electric eye which causes a light to turn on when someone passes by, and the light is off, may someone turn off the light-switch on Shabbos so that people can walk by ...
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2answers
123 views

Who is worried about affecting a refrigerator's thermostat on shabbat?

When one opens a refrigerator door, there are two classes of effects: Immediate result - e.g. light going on, or in newer models a fan might start. This class of effects can normally be fairly ...
2
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2answers
56 views

Can one disconnect an emergency lamp from power on shabbat?

This is an emergency torch. It is plugged on power and, in case the electricity stops, turns itself on automatically and runs on batteries for hours If power falls on shabbat, can one disconnect ...
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0answers
108 views

Temperature controlled urn on Shabbat

What issues may be at play when adjusting the temperature of an urn on Shabbat, e.g. from 200° F to 80° F, specifically on an urn pictured below*? (Assuming the water is already pre-boiled before ...
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0answers
192 views

Sewer pump usage on Shabbat

There are sewer tanks where, when full, an electric sewer pump automatically turns on. Is it a problem to pour water down the drain (washing hands, flushing the toilet) into such a sewer system? ...
3
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0answers
155 views

Is a Digital Clock muktzeh on Shabbos?

This question occurred to me over Shabbos, when my clock fell over. What Muktzeh category does a digital alarm clock fall into? If it has a backup battery, does that change anything? Additionally, if ...
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1answer
103 views

Adjusting Potentiometer on Yom Tov (eg. oven temperature)

Can someone point me in the direction of some Halachic sources to research the subject of potentiometers on Yom Tov? In the case of an oven, I had the understanding that as long as the fire was on ...
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0answers
335 views

Amazon's Alexa & Shabbos [duplicate]

Does anyone know of a definitive credible source about voice activated devices on Shabbat? Alexa has made life so much easier as my elderly mother can just use her voice to contact us. We have made ...
2
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1answer
149 views

Air purifier with LED sensor on Shabbat

Would one be allowed to use an air purifier with an LED smell indicator sensor on Shabbat if bringing in odors near the purifier with outside food or other odorous things could or most surely would ...
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0answers
30 views

What are the various views about electricity on Shabbos [duplicate]

This question discusses specifically R' Moshe's views on using electricity on Shabbos. What are some of the other major views out there (R' Shlomo Zalman, Tzitz Eliezer, etc.)? Believe it or not, ...
4
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1answer
366 views

Why isn't walking through a metal detector allowed on Shabbat because of pikuach nefesh?

I saw a few weeks ago that there are no security checks at the Kotel for religiously dressed Jews on Shabbat. This is to avoid having to walk through a metal detector, apparently. My question is, why ...
2
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1answer
79 views

Is a Highwire Eruv allowed?

Where can I found the discussion regarding the permissibility of using the hotwire/highwire (the electric wire which is all the way at the top of the utility pole) as part of the Eruv? Thanks The ...
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2answers
202 views

Audio Recording on Shabbat/Yom Tov

Would there be a problem with leaving a recorder on from before Shabbat or Yom Tov, and thereby recording a lecture given on Shabbat itself? There is a wealth of literature on the subject of Melacha ...
3
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1answer
140 views

Not using Electricity as a Minhag

This answer asserts that R' Auerbach held that not using electricity on Shabbat is a minhag. However, assuming that this ruling dates to the 1930s (which is what I have heard in the past), everyday ...
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2answers
339 views

Netilas Yadayim with automatic sinks

It seems there is precedent to allow for netilas yadayim when you don't have a cup, by turning the sink on and off for each rivi'is per hand. By employing this method you satisfy the requirement of ...
2
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1answer
748 views

Use induction on Yom Tov

May one use an induction stovetop on yom tov? I assume there's a fundamental difference if the pot is already on the stove before yom tov, and food is just poured inside; this should be permitted. ...
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1answer
737 views

Adjusting timers on Shabbat

Can one adjust a socket timer (picture below) on Shabbat to keep one's hotplate or lamp on for longer, etc?
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1answer
794 views

Electronic card readers to enter buildings on Shabbat?

As a student, I've noticed that practically all of the dormitories in my university require residents to tap their student cards to a sensor before they are allowed to enter their building. (Moreover, ...
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2answers
520 views

Kosher switch and Grama according to R. Belsky's letter

Yeshiva World News published a letter from Rabbi Belsky saying that the Kosher Switch accomplishes nothing and is simply a regular melacha. My question is basically the same as this commentor. Is ...
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1answer
233 views

using static guard on Shabbos

Would there be any reason why one would not be able to apply static guard to clothing on Shabbos? Would it make any difference if the clothing is currently being worn or not? Two points: 1- I ...
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1answer
241 views

Did any classic rabbinic sources discuss static electricity?

Not much more to add here, I've just always wondered if static electricity was discussed in any Chazzal or Rishonim. Someone from those times must've gotten a good zap and I'm wondering what they had ...
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2answers
2k views

Smart thermostat on Shabbos - what should one do?

I read an article recently regarding a person who went to a hotel and realized after Shabbos began that all the rooms were controlled by smart thermostats. A smart thermostat detects when one is in ...
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1answer
1k views

Apple Watch on Shabbat

Tech experts: Is there any way in which the Apple Watch could be used by shomrei Shabbat with limited functionality? Note: this question does not seek to ascertain whether the full gamut of features ...
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1answer
90 views

Snake lamps on Shabbos? [closed]

I have a pet snake that has two types of lamps. One lamp is turned on in the mornings (day lamp) and then the other is turned on at night (night lamp). They both are needed to produce light and heat ...
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3answers
2k views

Can you use electricity on Yom Tov

Yom Tov is slightly different than Shabbat. For example, on Shabbat one cannot cook, but one can cook on Yom Tov provided that it is from an existing flame. My question is this... Let's say I have ...
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3answers
416 views

Is this app really safe to use on Shabbat?

http://www.shabbosapp.com/ It is an interesting approach - trying to satisfy the major halachic issues, while skirting the stringencies. Halachically, what would be the status of using this phone on ...
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2answers
352 views

Is one allowed to use a pedometer on Shabbat?

If the pedometer is reset and already on before Shabbat starts, am I allowed to attach it to my person and walk with it on Shabbat, within an eruv? It is electric, and it appears to count steps with a ...
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1answer
1k views

Can one run a surveillance Camera on Shabbos?

Is there any prohibition in having surveillance cameras operating on Shabbos? If not, why is is any different to filming a Bar-Mitzva, etc?
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0answers
154 views

Crossing at a sensor-controlled traffic light on Shabbat

May one cross at a sensor-controlled traffic light on Shabbat / Yom Tov. I.e. - the light turns green only when it senses there is a pedestrian? Would it matter if it would be dangerous to cross ...
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1answer
178 views

Amirat goy on Shabbat in regards to electricity

Since many poskim hold that not using electricty on Shabbat is just a Minhag (Rav SZ. Aurbech), would they hold that it is 100% ok to ask a non-Jew to do things with electricity for you?
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4answers
1k views

May one say a blessing on light bulbs for shabbat

If one doesn't have candles for shabbat, may one say a blessing on light bulbs? Since the point is to have light for שלום בית (household serenity), it would seem that electric lights would have the ...
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0answers
50 views

Violating the Shabbat across time zones [duplicate]

Let's say I'm on my computer in the United States on a Friday afternoon, well before the sun has set in the US, but after it has set in Israel. If I access an Israeli website during this time, am I ...