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Figure 19 shows two electrical devices for heating water - Edexcel - GCSE Physics - Question 10 - 2019 - Paper 1

Question 10

Figure 19 shows two electrical devices for heating water. immersion heater connected to a battery kettle connected to domestic mains supply The current in the ele... show full transcript

Worked Solution & Example Answer:Figure 19 shows two electrical devices for heating water - Edexcel - GCSE Physics - Question 10 - 2019 - Paper 1

Step 1

Calculate the resistance of the immersion heater

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Answer

To find the resistance of the immersion heater, we can use the formula:

$P = I^2 R$

Where:

P is the power (130 W)
I is the current (14 A)
R is the resistance

Rearranging the formula to solve for resistance gives:

$R = \frac{P}{I^2}$

Substituting in the known values:

$R = \frac{130}{14^2} \approx 0.66 \, \Omega$

Thus, to two significant figures, the resistance of the immersion heater is:

0.66 Ω

Step 2

State two differences between the movement of charge in the heating element of the kettle and the movement of charge in the immersion heater

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Answer

The immersion heater is connected to a battery, providing direct current (DC) which means the charge flows consistently in one direction. In contrast, the kettle is connected to the mains supply, which provides alternating current (AC), causing the charge to reverse direction periodically.
The heating element in the kettle is designed to handle higher voltage and typically operates at a higher power level to rapidly heat water, while the immersion heater operates at lower voltage and power in a more controlled manner.

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