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c) A 24 V DC supply is connected in series across two resistors, R1= 70kΩ and R2=55kΩ. A voltmeter on a 20 V range, A
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c) A 24 V DC supply is connected in series across two resistors, R1= 70kΩ and R2=55kΩ. A voltmeter on a 20 V range, A
c) A 24 V DC supply is connected in series across two resistors, R1= 70kΩ and R2=55kΩ. A voltmeter on a 20 V range, A voltmeter is connected to measure the voltage across R1. The voltmeter sensitivity is 15kΩ/V. (i) Find the internal resistance of the voltmeter. 4 marks (ii) Find the voltage across R1 with the voltmeter connected and 6 marks sketch the circuit. (iii) Find the voltage across R1 with the voltmeter disconnected 6 marks and sketch the circuit.
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