Modern televisions use small amounts of power. (a) Which of these describes power. Put a cross (X) in the box next to your answer. ☐ A distance travelled per second ☐ B energy transferred ☐ C energy transferred per second ☐ D work done (b) A television is connected to the 230 V mains. When it is switched on, the current in the television is 0.25 A. (i) Calculate the power consumption of the television when it is switched on. power consumption = ________________ W (ii) Describe what is meant by current.

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Modern televisions use small amounts of power - Edexcel - GCSE Physics - Question 4 - 2012 - Paper 1

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Modern televisions use small amounts of power. (a) Which of these describes power. Put a cross (X) in the box next to your answer. ☐ A distance travelled per seco... show full transcript

Worked Solution & Example Answer:Modern televisions use small amounts of power - Edexcel - GCSE Physics - Question 4 - 2012 - Paper 1

Step 1

Which of these describes power.

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Answer

The correct answer is C: energy transferred per second. Power is defined as the rate at which energy is transferred or converted.

Step 2

Calculate the power consumption of the television when it is switched on.

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Answer

To calculate the power consumption, we use the formula: $P = V imes I$ Where:

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

Here, the voltage ( $V$ ) is 230 V, and the current ( $I$ ) is 0.25 A. Therefore, substituting the values gives:

$P = 230 imes 0.25 = 57.5 ext{ W}$

Rounding, we can say the power consumption is approximately 58 W.

Step 3

Describe what is meant by current.

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Answer

Current refers to the flow of electric charge in a circuit. It is measured in amperes (A), which indicates the rate of flow of charge. Specifically, current reflects how many electrons (or ions) pass through a given point in the circuit per second.

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