Electricity

11. Which material is a good insulator of electricity?

a) Copper

b) Aluminum

c) Iron

d) Glass

12. What is the formula to calculate electric resistance?

a) R = V/I

b) R = P/V

c) R = V x I

d) R = W/V

13. What is the voltage of a circuit if the resistance is 8Ω and the current is 4A?

a) 32V

b) 2V

c) 0.5V

d) 12V

14. What is the SI unit of electric charge?

a) Ampere

b) Ohm

c) Volt

d) Coulomb

15. What is the formula to calculate electric charge?

a) Q = V/I

b) Q = P/V

c) Q = V x I

d) Q = W/V