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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 electric motors, some energy is converted into heat, which can lead to overheating and reduced efficiency.

Step 2

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

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Answer

To find the expected current in the heater, you can use the formula derived from Ohm's law:

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

where:

$I$ is the current in amperes (A),
$P$ is the power in watts (W), and
$V$ is the voltage in volts (V).

Substituting the given values:

$P = 500 W$
$V = 230 V$

Substituting into the formula:

$I = \frac{500}{230}$

Calculating this gives:

$I \approx 2.17 A$

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

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