WorksheetsOhm's Law and Electrical Power
Total questions: 5
Worksheet time: 15mins
Name
Class
Date
1.
A heater takes a current of 2.77 A from a 220 V supply. What is the resistance?
4 lines
2.
How much current does a 50 Ω electric iron take if the applied voltage is 250 volt?
4 lines
3.
A metal filament lamp has a resistance of 55 Ω when cold and 622 Ω when hot. If the lamp works on a 230 V supply. Find: (a) the current at the moment of switching on (b) the current when the lamp has reached its working temperature.
4 lines
4.
An electromagnet of resistance 12.4 Ω requires a current of 1.5 A to operate. Find the required voltage.
4 lines
5.
What is an ampere equal to?
4 lines
100 %
