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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

An example of a device where the heating effect of an electric current is a disadvantage is 'overheating in a computer'. In such cases, unnecessary heat generation can lead to reduced performance and potential damage to components.

Step 2

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

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Answer

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

$I$ is the current (in Amperes),
$P$ is the power (in Watts), and
$V$ is the voltage (in Volts).

Substituting the values from the label:

$I = \frac{500 \text{ W}}{230 \text{ V}}$

Calculating:

Substitution: $I = \frac{500}{230}$
Evaluation results in:

$I \approx 2.17 ext{ A}$

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