Question 9.2.3: Additional Answer Options

9.1.1

DC motor

Tip: the presence of a cell/power source and split rings indicate that the machine is a DC motor.

1 mark

9.1.2

Electrical to mechanical/kinetic energy

Tip: a motor converts electrical energy into mechanical energy, specifically kinetic energy.

2 marks

(1 x 2 marks)

9.1.3

Split ring/commutator

1 mark

9.1.4

Anticlockwise

Tips: 

• The current flows around the circuit in the direction shown in the image below.
• Using Fhleming's left-hand motor rule, the direction of the force can be determined. This shows that the coil rotates in an anticlockwise direction.

2 marks

(1 x 2 marks)

9.2.1

(The RMS voltage/value of AC is) the AC voltage/potential difference which dissipates the same amount of energy/heat/power as an equivalent DC voltage/potential difference.

Or

The RMS voltage/value of AC is the DC potential difference which dissipates the same amount of energy/heat/power as AC.

2 marks

(1 x 2 marks)

9.2.2

Option 1

Or

Option 2

Or

Option 3

3 marks

(3 x 1 mark)

9.2.3

Option 1

^{(1 + 2)}

^{(3 + 4)}

⁽⁵⁾

Tip: the time must be in seconds, therefore, minutes are converted to seconds.

There are more ways to answer this question. To view other options, click here.

5 marks

(5 x 1 mark)

Option 1 marking criteria:

• ^{(1 + 2)} Appropriate formula for W containing V
• ^{(3 + 4)} Substitution
• ⁽⁵⁾ Final answer: 55785,12 J