Electrical Circuits

Question 1

Define potential difference

Answer 1

The work done per unit positive charge.

Question 2

Define current

Answer 2

Rate of flow of charge.

Question 3

Define ohm’s law

Answer 3

Current through a conductor is directly proportional to the potential difference over a conductor at constant temperature.

Question 4

Define resistance

Answer 4

A material’s opposition to the flow of electric current.

Question 5

Define electrical power

Answer 5

The electrical power dissipated in a device is equal to the product of the
potential difference across the device and the current flowing through the device.

Question 6

Define kilowatt hour

Answer 6

It is a unit of energy, and 1 kWh is the amount of energy used when 1 kilowatt of energy is used for 1 hour.

Question 7

Define EMF

Answer 7

The total amount of energy supplied per coulomb of charge by the cell.

Question 8

Define internal resistance

Answer 8

The resistance inside a real battery.