F5 Phy Chp3.3 3.4 Review Quiz

What does terminal potential difference refer to?

• Potential difference across the two terminals of an electric source

• Potential difference across the load resistance

• Potential difference across the internal resistance

• Potential difference when no current flows

If internal resistance is ignored, what is the relationship between terminal potential difference and e.m.f.?

• They are unrelated

• They are equal

• Terminal potential difference is always lower

• Terminal potential difference is greater

In the equation E = V + Ir, what does 'E' represent?

• Internal resistance

• Terminal potential difference

• Electromotive force (e.m.f.)

• Load resistance

Which statement is correct about the resistance in, r, of a dry cell?

• The internal resistance, r depends on the current flow

• The internal resistance, r can be calculated by the formula r =

  (V-E)/I

• Resistance to charge movement which is due to its electrolytes in the cell.

• Work done by a source to move a unit of charge through a complete circuit

Diagram 2(a) and 2(b) show two electrical circuits connected to similar dry cells.

• 0.2 Ω

• 0.3 Ω

• 1.0 Ω

• 1.5 Ω

Diagram 1 shows an electrical circuit consists of a dry cell and a resistor, R. The dry cell has

an internal resistance, r.

What will happen to the voltmeter reading and the internal resistance when the resistance R

increases?

• Both voltmeter reading and internal resistance increased

• Voltmeter reading increases, internal resistance unchanged

• Voltmeter reading unchanged, internal resistance increases

• Both voltmeter reading and internal resistance remains unchanged

Diagram shows a electrical circuit. The internal resistance for the cell is 1 Ω

When the switch is closed, the voltmeter and ammeter readings are 6 V and 3 A. respectively.

Calculate the electromotive force of the cell.

• 3 V

• 6 V

• 9 V

• 12 V

What does it mean by 60W?

• Rate of change of current is 60 W

• Rate of change of voltage is 60 W

• Rate of change of power is 60 W

• Rate of change of energy is 60 W

Power for an immersion heater is 240V, 1.5kW. What is the resistance for the

immersion heater?

• 6.25 Ω

• 38.4 Ω

• 600 Ω

• 937 Ω

An electric motor has an input energy of 200 J and output energy of 180 J.

Which statement is correct?

• A

• B

• C

• D