9.1 When the coil of the generator rotates clockwise between the two poles of the magnet, the direction of the induced current is from X to Y, as shown above - NSC Physical Sciences - Question 9 - 2023 - Paper 1

After rotating the coil through 180°, the direction of the magnetic field concerning the coil reverses, affecting the induced current direction.

The direction of the current will reverse to go from Y to X after the coil rotates 180°.

To calculate the resistance (R) of the device, use the formula:

$R = \frac{V_{rms}}{I_{rms}}$

Given:

• $V_{rms} = 200 \ V$
• $I_{rms} = 6 \ A$

Substituting the values:

$R = \frac{200 \ V}{6 \ A} = 33.33 \Omega$

The energy (W) consumed can be calculated using the formula:

$W = V_{rms} \times I_{rms} \times t$

Where:

• $t = 2 \ hours = 7200 \ seconds$

Substituting the values:

$W = 200 \ V \times 6 \ A \times 7200 \ s = 8640000 \ J$