Chapter 11 Electricity Questions-04
QUESTIONS
1. Draw a schematic diagram of a circuit consisting of a battery of three cells of
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Answer
Three cells of potential
2. Redraw the circuit of Question 1, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across the
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Answer
An ammeter should be connected in the circuit in series with the resistors. To measure the potential difference across the resistor it should be connected in parallel, as shown in the following figure.
The resistances are connected in series.
Ohm’s law can be used to obtain the readings of ammeter and voltmeter. According to Ohm’s law,
Where,
Potential difference,
Current flowing through the circuit/resistors
Resistance of the circuit,
Potential difference across
Current flowing through the
Therefore, using Ohm’s law, we obtain
Therefore, the reading of the ammeter will be
The reading of the voltmeter will be
