GCSE Edexcel Physics Combined Science Power: This question is about using the

Question

This question is about using the mains electricity supply.

(a) (i) An electric kettle is used to boil some water.
The mains supply voltage is 230 V.
The power supplied to the kettle is 1.9 kW.
Calculate the current in the kettle.
Use the equation

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

(ii) A coffee machine takes 120s to heat some water.
Mains supply voltage = 230 V.
Current in this coffee machine = 7.4 A.
Calculate the energy transferred to the coffee machine in 120s.
Use an equation selected from the list of equations at the end of the paper.

(b) Figure 7 shows the inside of a mains plug.
The neutral wire is labelled.

(i) State the name of wire X and the name of wire Y.

(ii) State the name of component Z.

(c) A transformer is used to connect a laptop computer to the mains electricity supply.
The input voltage to the transformer is 230 V.
The output current from the transformer is 2.37 A.
The transformer has an output voltage of 190 V.
The transformer used is 100% efficient.

Calculate the input current to the transformer.
Use the equation

$$	ext{input current} 	imes 	ext{input voltage} = 	ext{output current} 	imes 	ext{output voltage}$$

This question is about using the mains electricity supply - Edexcel - GCSE Physics Combined Science - Question 3 - 2021 - Paper 1

Worked Solution & Example Answer:This question is about using the mains electricity supply - Edexcel - GCSE Physics Combined Science - Question 3 - 2021 - Paper 1

Calculate the current in the kettle.

Calculate the energy transferred to the coffee machine in 120s.

State the name of wire X and the name of wire Y.

State the name of component Z.

Calculate the input current to the transformer.

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