Current Electricity

Instrument which transfers energy to electric charge in a circuit is

• Battery

• Voltmeter

• Ammeter

• Galvanometer

EMF is an abbreviation of

• Electromotive force

• Electric motive force

• Electrical motive force

• Both a and b

Electromotive force of a battery can be defined with the formula of

• E = IR

• E = IR + I

• E = IR + r

• E = IR + Ir

It is an energy supply by a battery/ electrical source to a coulumb unit of charge.

This refers to

• Potential difference

• Internal resistance

• Electromotive force

• Current

It is a work done or energy supply to move a unit of charge from 1 point to another point in a closed circuit

This refers to

• Internal resistance

• Potential difference

• Electromotive force

• Resistance

The cell has internal resistance, r, and electromotive force of 1.5 V.
What is the reading of voltmeter when the switch is closed?

• More than 3.0 V
• Less than 1.5 V
• More than 1.5 V
• 1.5 V

Which is a true statement?

• No sources of emf have internal resistance

• Some sources of emf have internal resistance

• Most sources of emf have internal resistance

• All sources of emf have internal resistance

What is the internal resistance of the battery in the circuit?

• 9.40 Ω
• 11.50 Ω
• 12.50 Ω
• 13.50 Ω

Correct

•  $\epsilon=V+Ir$  

•  $\epsilon=I\left(R+r\right)$  

•  $\epsilon=V$  

The gradient of this line represents the

• internal resistance

• emf of the cell

• power of the cell

• resistance of the circuit