Physics Form 5 KBSM 2.4 EMF & Internal resistance

EMF is ________ done by a source to move 1C of charge through a complete circuit.

• work

• resistance

• current

• voltage

The SI unit for EMF is

• JC^-1

• VA^-1

• ΩA^-1

• VC^-1

Internal resistance in a cell is

• resistance against the moving charge due quality.

• resistance against the moving charge due materials.

• resistance against the moving charge due to electrolyte.

• resistance against the moving charge due to time taken.

In this circuit, why the voltmeter reading is less than 5 V when the switch is closed?

• There are no current flow

• The current flow is not enough

• There are heating in resistor

• There are drop of voltage due to internal resistance

The graph of V against I below is plotted after an experiment. Which circuit diagram is used?

• 
• 
• 
• 

Which formula is correct?

•  $E=I\left(R+r\right)$  

•  $E=V+r$  

•  $E=V-r$  

•  $E=Ir-IR$  

A car battery labelled 12 V is used to supply the electrical energy to an electric motor. Noticed that, only 92 J of energy supply by the battery to move 8 C of charge through the motor. How much the voltage drop due to internal resistance of the battery?

• 61.3 V

• 12.8 V

• 11.5 V

• 0.5 V

A car battery has an emf of 12V and an internal resistance of 0.005Ω. The terminal voltage when a load current of 100A is drawn is...

• 11.5 V

• 1.7 V

• 6.0 V

• 0.5 V

A battery has an e.m.f of 6.0 V. When it is connected to an external resistor, the potential different is 2.6 V and the current is 0.6 A. 
What is the value of the internal resistance?

• 3.4 Ω
• 4.3 Ω
• 4.4 Ω
• 5.7 Ω

Look at the graph and use it to work out ε and r

• E = 0.8V, r = 1.2Ω

• E = 1.2V, r = 2.0Ω

• E = 1.2V, r = 0.5Ω

• E = 0.8V, r = 2.0Ω