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, the resistance of the lamp is 40Ω. 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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1 Figure 1 shows an electrical circuit - Edexcel - GCSE Physics - Question 1 - 2021 - Paper 1

Question 1

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 ... show full transcript

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

Step 1

Draw a circuit diagram of the electrical circuit in Figure 1

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Answer

To draw the circuit diagram based on Figure 1, include the following components:

Battery Symbol: Representing the 9V battery.
Lamp Symbol: Indicating the lamp in the circuit.
Switch Symbol: Showing the switch.

Make sure to connect these components in a series configuration, ensuring that the current path is complete from the battery through the lamp and switch back to the battery.

Step 2

Calculate the voltage across the lamp

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Answer

Using the provided values, where the current (I) is 0.15 A and the resistance (R) is 40Ω, we can use Ohm's law to find the voltage (V):

$V = I \times R$

Substituting the values: $V = 0.15\,\text{A} \times 40\,\Omega = 6\,\text{V}$

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 2 A.

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