G8 Ch. 7

The main function of various electric cells is

• To help in the flow of current

• To maintain a constant potential difference between its two terminals

• To Conduct electricity to various appliances

• To help the charges to flow

Lithium ion cells can be

Which of the following best describes the role of an electric cell in a circuit?

• It increases the resistance of the circuit

• It prevents the flow of current

• It supplies energy to move charges through the circuit

• It stores the electric current

What does an electric cell provide to a circuit?

• Potential difference

• Magnetic field

• Heat energy

• Mechanical energy

Why is an electric cell necessary in an electric circuit?

• To increase the resistance

• To maintain a continuous flow of electric charges

• To decrease the voltage

• To stop the current

Identify the components of the lead acid cell.

a

b

c

d

PbO2

Cathode

Pb

H2SO4

Define electromagnet

Draw a simple electric circuit