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Q1 Answers

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Questions
1) Figure 1 shows a circuit diagram containing two identical lamps arranged in parallel.
The reading on the ammeter is 186 mA. 
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1.1) ​Which statement about the current through the lamps is true? Tick one box. ​ [1 mark]
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1.2) ​One of the lamps breaks and is not replaced.
Which statement about the current in the other lamp is true?
​Tick one box. [1 mark]
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Figure 2 shows a circuit that can be used to alter the brightness of a lamp. 
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1.3) The resistance of the variable resistor is increased.
What effect will this have on the brightness of the lamp?
Explain your answer. [2 marks]

When the potential difference across the lamp is 3.3 V, the current is 0.15 A.
1.4) Write down the equation that links current, potential difference and resistance. [1 mark]

Equation _____________________________________________

1.5) Calculate the resistance of the lamp. [3 marks]
​
Resistance = _____________ Ω
​
1.6) ​Sketch a current–potential difference graph for a filament lamp. [1 mark]
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​​​​​​(Total for Question 1 = 9 marks)
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