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A greenhouse contains an electric heater - Edexcel - GCSE Physics - Question 3 - 2012 - Paper 1

Question 3

A greenhouse contains an electric heater. (a) The heater makes good use of the heating effect of an electric current. Give an example of a device where the heating... show full transcript

Worked Solution & Example Answer:A greenhouse contains an electric heater - Edexcel - GCSE Physics - Question 3 - 2012 - Paper 1

Step 1

Give an example of a device where the heating effect of an electric current is a disadvantage.

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Answer

One example of a device where the heating effect of an electric current is a disadvantage is an electric motor. In this case, any waste heat generated can lead to inefficiency as it contributes to overheating.

Step 2

Use this information to calculate the expected current in the heater.

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Answer

To find the current, we use the formula: $I = \frac{P}{V}$
where:

$P$ is the power in watts (500 W)
$V$ is the voltage in volts (230 V)

Substituting the values:
$I = \frac{500 \, \text{W}}{230 \, \text{V}}$
$I \approx 2.17 \, \text{A}$

Thus, the expected current in the heater is approximately 2.17 A.

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