Figure 1 shows an electrical circuit. (a) Draw a circuit diagram of the electrical circuit in Figure 1 in the space below. (b) When the current in a lamp is 0.15 A, the resistance of the lamp is 40 Ω. Calculate the voltage across the lamp. Use the equation V = I × R (c) Figure 2 shows an ammeter that can read up to 5 A. State the value of the current shown on the ammeter in Figure 2.

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Figure 1 shows an electrical circuit - Edexcel - GCSE Physics Combined Science - Question 1 - 2021 - Paper 1

Question 1

Figure 1 shows an electrical circuit. (a) Draw a circuit diagram of the electrical circuit in Figure 1 in the space below. (b) When the current in a lamp is 0.15... show full transcript

Worked Solution & Example Answer:Figure 1 shows an electrical circuit - Edexcel - GCSE Physics Combined Science - Question 1 - 2021 - Paper 1

Step 1

Draw a circuit diagram of the electrical circuit in Figure 1 in the space below.

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Answer

To draw the circuit diagram, include:

A battery or cell symbol to represent the 9V battery.
A lamp symbol for the bulb.
A switch symbol, indicating the open/closed state.
Connect these components in series to complete the circuit. Ensure that the lamp is connected to the battery with the switch in between.

Step 2

Calculate the voltage across the lamp.

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Answer

To find the voltage across the lamp, use the formula:

$V = I \times R$ Substituting the values:

Current ( I) = 0.15 A
Resistance ( R) = 40 Ω

We calculate:

$V = 0.15 \text{ A} \times 40 \text{ Ω} = 6 \text{ V}$

Thus, the voltage across the lamp is 6 V.

Step 3

State the value of the current shown on the ammeter in Figure 2.

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Answer

The value of the current shown on the ammeter in Figure 2 is approximately 2 A.

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