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
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Answer
To draw the circuit diagram:
Use the symbol for the battery, which consists of a long and a short line to represent the positive and negative terminals, respectively.
Represent the lamp (bulb) with a circle containing an 'X' inside it, indicating a filament bulb.
Indicate the switch using a break in the circuit line showing open or closed status to depict whether the circuit is complete or not.
Connect these components in series to form a complete circuit as illustrated in Figure 1.
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×R
Where:
I = Current = 0.15 A
R = Resistance = 40 Ω
Substituting these values into the equation:
V=0.15×40=6 V
Therefore, 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.
