10 (a) Figure 19 shows two electrical devices for heating water. immersion heater connected to a battery kettle connected to domestic mains supply Figure 19 i) The current in the element of the immersion heater is 14 A. The power of the immersion heater is 130 W. Calculate the resistance of the immersion heater. Give your answer to two significant figures. (ii) The current in the heating element of the kettle is 8.3 A. State two differences between the movement of charge in the heating element of the kettle and the movement of charge in the immersion heater.

GCSE Edexcel Physics Energy in circuits: 10 (a) Figure 19 shows two elect

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

Question 10

10 (a) Figure 19 shows two electrical devices for heating water. immersion heater connected to a battery kettle connected to domestic mains supply Figure 19 i) T... show full transcript

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

Step 1

i) Calculate the resistance of the immersion heater.

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Answer

To find the resistance of the immersion heater, we can use Ohm's law, which states that:

$R = \frac{V}{I}$

However, we can also reformulate the power formula as:

$P = I^2 R$

Where:

P is the power (in watts)
I is the current (in amperes)
R is the resistance (in ohms)

Given that the power of the immersion heater is 130 W and the current flowing through it is 14 A, we can rearrange the formula to find R:

$R = \frac{P}{I^2} = \frac{130}{(14)^2}$

Calculating this: $R = \frac{130}{196} \approx 0.6633 \text{ ohms}$

Rounding to two significant figures gives:

$R \approx 0.66 \text{ ohms}$

Step 2

ii) 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

In the kettle, the heating element is connected to the domestic mains supply, which typically provides alternating current (AC). In contrast, the immersion heater is connected to a battery, providing direct current (DC).
The current in the kettle's heating element is 8.3 A, while the immersion heater's element has a higher current of 14 A. This indicates different power requirements and potentially different heating efficiencies.

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

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

i) Calculate the resistance of the immersion heater.

ii) 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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