Figure 10 shows two electrical devices for heating water. 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. 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 Combined Science Power in circuits: Figure 10 shows two electrical d

Figure 10 shows two electrical devices for heating water - Edexcel - GCSE Physics Combined Science - Question 6 - 2019 - Paper 1

Question 6

Figure 10 shows two electrical devices for heating water. The current in the element of the immersion heater is 14 A. The power of the immersion heater is 130 W. Ca... show full transcript

Worked Solution & Example Answer:Figure 10 shows two electrical devices for heating water - Edexcel - GCSE Physics Combined Science - Question 6 - 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 relating power, current, and resistance:

$P = I^2 R$

Given that the power (P) is 130 W and the current (I) is 14 A, we can rearrange the formula to solve for resistance (R):

Substitute the given values into the formula: $130 = (14)^2 R$
Calculate $14^2$ : $14^2 = 196$
Rearranging gives: $R = \frac{130}{196}$
Evaluating the expression: $R \approx 0.663 \Omega$ R rounded to two significant figures is: $R \approx 0.66 \Omega$

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 rate of flow of charge in the immersion heater is greater than in the kettle heating element; it moves faster.
The direction of the flow of charge in the kettle changes continuously, while in the immersion heater, it flows more uniformly in one direction.

Figure 10 shows two electrical devices for heating water - Edexcel - GCSE Physics Combined Science - Question 6 - 2019 - Paper 1

Worked Solution & Example Answer:Figure 10 shows two electrical devices for heating water - Edexcel - GCSE Physics Combined Science - Question 6 - 2019 - Paper 1

Calculate the resistance of the immersion heater

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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