Electrical Engineering - Energy and Power - Discussion

P=VI=I^2*R.

Resistance produces Heat.
Heat is a change in temperature.

Power rating they refer to a true power which is normally in the volt-Amp unit such as VA, KVA, MVA. So my answer is False.

Take a heater coil when we use its full length and when we use a fraction of it, power rating does change.

Basically, the formula for power is P = VIpf m also P = i * i * R, so it is related. but the answer says it is not maybe power rating they refer to a true power which is normally in the volt-Amp unit such as VA, KVA, MVA.

@Kundan.

My view is "Power is related to both current and resistance in the closed circuit".

p = i*i*R.

R-Resistance, so it will including in power value.

In devices which primarily dissipate electric power or convert it into mechanical power, such as resistors, electric motors, and speakers, the power rating given is usually the maximum power that can be safely dissipated by the device. The usual reason for this limit is heat, although in certain electromechanical devices, particularly speakers, it is to prevent mechanical damage. When heat is the limiting factor, the power rating is easily calculated. First, the amount of heat that can be safely dissipated by the device.

Power rating is related to Temperature.

Which one is related to power rating?