5 (a) Complete the sentence by putting a cross (X) in the box next to your answer. An electric current is the rate of flow of ☐ A atoms ☐ B charge ☐ C molecules ☐ D voltage (b) An electric heater is connected to a mains voltage of 230 V. The current in the heater is 9.2 A. Calculate the power. (c) The power supplied to a desktop computer is 350 W. The cost of 1 kWh of electricity is 20 p. Calculate the cost of using the computer for 4 hours.

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5 (a) Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Physics - Question 5 - 2018 - Paper 1

Question 5

5 (a) Complete the sentence by putting a cross (X) in the box next to your answer. An electric current is the rate of flow of ☐ A atoms ☐ B charge ☐ C molecules... show full transcript

Worked Solution & Example Answer:5 (a) Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Physics - Question 5 - 2018 - Paper 1

Step 1

Complete the sentence

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Answer

The correct answer is B charge, as electric current is defined as the rate of flow of electric charge.

Step 2

Calculate the power

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Answer

Power can be calculated using the formula: $P = VI$ , where $V$ is voltage and $I$ is current.

Thus, $P = 230 ext{ V} imes 9.2 ext{ A} = 2116 ext{ W}$

So, the power is 2116 W.

Step 3

Calculate the cost of using the computer for 4 hours

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Answer

First, determine the energy consumed in kilowatt-hours (kWh):

The power is 350 W which is equivalent to 0.35 kW. Over 4 hours, the energy consumed will be: $ext{Energy} = 0.35 ext{ kW} imes 4 ext{ h} = 1.4 ext{ kWh}$

Now, to find the cost: $ext{Cost} = 1.4 ext{ kWh} imes 20 ext{ p} = 28 ext{ p}$

So, the cost of using the computer for 4 hours is 28 p.

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