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:
extPower(P)=Voltage(V)imesCurrent(I)
Given that the voltage is 230 V and the current is 11 A, we can substitute these values into the formula:
P=230imes11
Evaluating this gives:
P=2530extW
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).
