Is it using electricity?

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Is there an indicator light ....like a red light to show that it is on? Or a clock....then yes, it will take a little electricity. Something like a toaster, mixer, or other appliance without a light indicator will not take electricity.

The answer is yes in most cases. If your stove has a clock it is using electricity. If your television is off it still uses electricity. I am sure there are many more examples but I know these for sure.

Yes and no. Depends on the appliance or types of equipment you have in your house. I have hardly any, I do not even own a computer, my house is extremely "low tech." Check out these articles which explain in greater detail.

https://www.nytimes.com/2016/05/08/science/just-how-much-power-do-your-electronics-use-when-they-are-off.html

https://www.scienceabc.com/eyeopeners/appliance-plugged-wall-socket-turned-off-electricity-usage-trickle-charge.html

Yes generally. It is called a phantom load. Hubby used surge protectors and turns it off from one central location. One switch turns off 4 different items.

Many do, as mentioned in the other responses.

yes

Generally yes if you us a button or switch on the appliance to turn it off. There are many electric appliances like TV sets that only go into sleep mode when turned off so they can activate quickly when turned on. Other electric appliances have accessories like clocks, motion sensors, etc. that do not turn off when the appliance switch is switched off. If you turn an electric appliance off with a switch separate from the appliance, like electric breaker, wall switch or extension cord on/off switch then no electricity can get to the appliance. That does not mean that the appliance is de-energized. Many still have capacitors that hold a charge and can give you a wallop of a shock.