Ray  Dart
Ray Dart answered Sven Verhaeghe's question

A conventional battery can be used time and again to do that.

On a survival course many years ago, on Romney Marsh. We were given a old torch battery and some wire wool  and expected to start a fire. It worked, along with some burned fingers.

I guess you are more likely to be carrying tinfoil … Read more

Holly North
Holly North answered

A coil of wire inculed with voltage. This voltage is called induced voltage and it is induced due to the change in magnetic flux of the coil. If we take a current carry wire, a magnetic field will be there due to flow of current. If we change the current of wire, magnetic flux will … Read more

Tom  Jackson
Tom Jackson answered

If you are talking about a typical and properly wired electrical circuit in a house, the black is the hot wire, the white is the neutral and the bare copper wire is the ground.

The current in such a circuit is alternating. The white wire will have the same voltage as the black wire if the … Read more

Rooster Cogburn
Rooster Cogburn answered Anonymous' question

I don't know for sure, but I would certainly not plug them in while the computer is plugged in and running. I'm honestly confused as to why you need to consider doing something like this...? It's not something I've ever thought about doing for any reason. I asked my PC guru and he said the … Read more

Ancient Hippy
Ancient Hippy answered Virginia Lou's question

The reason to shut off the electricity to the heater is for shock reasons. The temp adjustments (2) are at the upper and lower coils. Risk of shock is great at these two points. Your heater is on a 220v breaker. If you are unsure, just shut off the main breaker in your box. That … Read more

Ancient Hippy
Ancient Hippy answered christine nassour's question
A parallel circuit is a closed circuit in which the current divides into two or more paths before recombining to complete the circuit. Each load connected in a separate path receives the full circuit voltage, and the total circuit current is equal to the sum of the individual branch currents.