An electric kettle is plugged into the 230 V mains. The current in the heating element of the kettle is 11 A. Calculate the power supplied to the kettle. An electric toothbrush is powered by a rechargeable battery. (i) Complete the sentence by putting a cross (✗) in the box next to your answer. Energy is stored in the battery as ☐ A kinetic energy ☐ B thermal energy ☐ C chemical energy ☐ D gravitational potential energy (ii) One part of the battery charger changes the 230 V mains voltage to 9.0 V. State the name of this part of the battery charger.

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An electric kettle is plugged into the 230 V mains - Edexcel - GCSE Physics - Question 5 - 2016 - Paper 1

Question 5

An electric kettle is plugged into the 230 V mains. The current in the heating element of the kettle is 11 A. Calculate the power supplied to the kettle. An elect... show full transcript

Worked Solution & Example Answer:An electric kettle is plugged into the 230 V mains - Edexcel - GCSE Physics - Question 5 - 2016 - Paper 1

Step 1

Calculate the power supplied to the kettle.

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Answer

To calculate the power supplied to the kettle, we will use the formula:

ext{Power} (P) = Voltage (V) imes Current (I)

Given that the voltage is 230 V and the current is 11 A, we can substitute these values into the formula:

P = 230 imes 11

Evaluating this gives:

P = 2530 ext{ W}

Therefore, the power supplied to the kettle is 2530 W, which can be rounded down to 2500 W.

Step 2

Complete the sentence by putting a cross (✗) in the box next to your answer.

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Answer

The correct answer is C: chemical energy. Energy in rechargeable batteries is stored in the form of chemical energy, which can be converted into electrical energy when needed.

Step 3

State the name of this part of the battery charger.

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Answer

The part of the battery charger that changes the 230 V mains voltage to 9.0 V is called a transformer. Specifically, it is known as a switch mode transformer or SMPS (Switch Mode Power Supply).

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An electric kettle is plugged into the 230 V mains - Edexcel - GCSE Physics - Question 5 - 2016 - Paper 1

Worked Solution & Example Answer:An electric kettle is plugged into the 230 V mains - Edexcel - GCSE Physics - Question 5 - 2016 - Paper 1

Calculate the power supplied to the kettle.

Complete the sentence by putting a cross (✗) in the box next to your answer.

State the name of this part of the battery charger.

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