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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.
Answer
The circuit diagram should include a battery symbol (representing the 9V battery), a lamp symbol (depicting the lamp), and a switch symbol (showing the switch). All components should be connected in a series arrangement, ensuring that the positive terminal of the battery connects to one terminal of the switch and the other terminal of the switch connects to one terminal of the lamp. The other terminal of the lamp should then connect back to the negative terminal of the battery, forming a complete circuit.
Step 2
When the current in a lamp is 0.15 A, the resistance of the lamp is 40 Ω. Calculate the voltage across the lamp.
Answer
To calculate the voltage across the lamp, we use the formula:
Substituting the given values:
- Current (I) = 0.15 A
- Resistance (R) = 40 Ω
Thus,
So, the voltage across the lamp is 6 V.
Step 3