1.   State an equation that links power, voltage and resistance. 

2.   Calculate the missing values in the table below.

 

3.   An electric fan is connected to the mains at 230 V. Calculate its operational resistance if it has a power of 50 W.

 

 

4.   An electric kettle is rated at 2·2 kW. Calculate the resistance of the element if it is connected to the mains at 230 V.

5.   A low voltage spotlight used in a kitchen operates from 12 V. Calculate the power of the lamp if it has a resistance of 3 Ω.

6.   A 12V, 36 W light bulb is connected to a 12 V supply. Calculate the resistance of the filament.