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 0.1... 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, use the following symbols:

Battery/cell symbol: Represent this with a long line and a short line.
Lamp symbol: Represent this with a circle and a cross inside, indicating a filament bulb.
Switch symbol: Represent this as a break in the line with a small curve indicating it's open.

Ensure that these symbols are connected in a series, forming a complete circuit.

Step 2

Calculate the voltage across the lamp.

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Answer

To find the voltage across the lamp, we will use Ohm’s Law, which is given by:

$V = I imes R$

Where:

$I = 0.15 A$ (current)
$R = 40Ω$ (resistance)

Substituting the values:

$V = 0.15 A imes 40Ω = 6 V$

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

Based on Figure 2, the value of the current shown on the ammeter is 2 A.

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