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 A... 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 for the electrical circuit in Figure 1:

Use the symbol for a battery or cell, representing the 9V battery.
Add the symbol for the lamp connected in the circuit.
Include the switch symbol to show that the circuit can be opened or closed.
Ensure the arrangement shows a complete series circuit, with appropriate connections between the elements.

Step 2

Calculate the voltage across the lamp.

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Answer

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

$V = I imes R$

Substituting the given values:

Current, $I = 0.15 ext{ A}$
Resistance, $R = 40 ext{ Ω}$

Thus,

$V = 0.15 ext{ A} imes 40 ext{ Ω} = 6 ext{ V}$

So, 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

From Figure 2, the ammeter reads a current of 2 A.

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