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1 markResistance, R

CSEC Physics · 1996 · Paper 2 · Question 4(a)(ii)

The circuit shown in Figure 6 investigates the relationship between applied potential difference and current for a 10 Ω carbon resistor using a 3.0 V battery of negligible internal resistance, an ammeter of negligible resistance, and a 20 Ω rheostat.

Explain why it is necessary for the voltmeter to have a high resistance.

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Other parts of this question

  1. 4(a)(i)Draw a circuit diagram to represent this arrangement of components.[3 marks]
  2. 4(a)(iii)Complete Table 2 to show how the meter readings change when the sliding contact on the rheostat is moved from end X to the other end Y.[5 marks]
  3. 4(b)(i)Find the resistance of the resistance wire.[3 marks]
  4. 4(b)(ii)Find the resistance of the lamp when the current flowing is 0.20 A.[2 marks]
  5. 4(b)(iii)The lamp, resistance wire and a battery are now connected in series. If the current in the circuit is 0.20 A, determine the total potential difference across…[2 marks]

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