Electrical Circuits

Question 1

Define potential difference:

Answer 1

potential difference is the work done per unit positive charge.

Question 2

Define current:

Answer 2

current is the rate of flow of charge.

Question 3

State Ohm’s law:

Answer 3

Ohm’s Law states that the current through a conductor is directly proportional to the potential difference
over a conductor at constant temperature.

Question 4

Define resistance:

Answer 4

Resistance is a material’s opposition to the flow of electrical 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

What is a kilowatt hour?

Answer 6

A kilowatt hour 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

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

Question 8

Define internal resistance:

Answer 8

Internal resistance is the resistance inside a real battery.