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What equation links current (I), potential difference (V) and power (P)? Tick (✓) one box - AQA - GCSE Physics - Question 11 - 2022 - Paper 1

Question 11

What equation links current (I), potential difference (V) and power (P)? Tick (✓) one box. P = V × I When a person walks on a tile, a potential difference of 40 V ... show full transcript

Worked Solution & Example Answer:What equation links current (I), potential difference (V) and power (P)? Tick (✓) one box - AQA - GCSE Physics - Question 11 - 2022 - Paper 1

Step 1

What equation links current (I), potential difference (V) and power (P)?

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Answer

The correct equation that links current (I), potential difference (V), and power (P) is:

$P = V \times I$

Step 2

Calculate the current in the tile.

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Answer

To calculate the current (I) in the tile, we use the formula:

$P = V \times I$

Given:

Power output, $P = 4.4 \text{ W}$
Potential difference, $V = 40 \text{ V}$

Substituting the known values:

$4.4 = 40 \times I$

Now, solve for I:

$I = \frac{4.4}{40} = 0.11 \text{ A}$

Step 3

What equation links efficiency, total power input and useful power output?

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Answer

The equation that links efficiency, useful power output, and total power input is:

$\text{Efficiency} = \frac{\text{Useful power output}}{\text{Total power input}}$

Step 4

Calculate the useful power output of the LED light.

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Answer

To find the useful power output of the LED light, we use the efficiency formula:

$\text{Efficiency} = \frac{\text{Useful power output}}{\text{Total power input}}$

Given:

Efficiency = 0.85
Total power input = 4.0 W

We rearrange the formula to find the useful power output:

$\text{Useful power output} = \text{Efficiency} \times \text{Total power input}$

Substituting the known values:

$\text{Useful power output} = 0.85 \times 4.0 = 3.4 \text{ W}$

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What equation links current (I), potential difference (V) and power (P)? Tick (✓) one box - AQA - GCSE Physics - Question 11 - 2022 - Paper 1

Worked Solution & Example Answer:What equation links current (I), potential difference (V) and power (P)? Tick (✓) one box - AQA - GCSE Physics - Question 11 - 2022 - Paper 1

What equation links current (I), potential difference (V) and power (P)?

Calculate the current in the tile.

What equation links efficiency, total power input and useful power output?

Calculate the useful power output of the LED light.

Join the GCSE students using SimpleStudy...

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