Physics for IGCSE & O level - Electricity (Section 5 - No. 4)
Which of the following are correct about an appliance's power rating?
It is measured in Watts.
It shows the actual power when used at the correct voltage.
It indicates the rate at which energy is transformed.
It is always the same, regardless of the voltage used
解释
The power rating is in Watts, the actual power at a specified voltage, and the rate of energy transformation.