Current Electricity and Electrical InstrumentHard
Question
By mistake, a voltmeter is placed in series and an ammeter in parallel with a resistance in an electric circuit, with a cell in series.
Options
A.The main current in the circuit will be very low and almost all current will flow through the ammeter, if resistance of ammeter is much smaller than the resistance in parallel.
B.If the devices are ideal, a large current will flow through the ammeter and it will be damaged
C.If the devices are ideal, ammeter will read zero current and voltmeter will read the emf of cell
D.The devices may get damaged if emf of the cell is very high and the meters are nonideal.
Solution
For non ideal ammeter and voltmeter, ammeter have low resistance and voltmeter have high resistance. Therefore the main current in the circuit will be very low and almost all current will flow through the ammeter. It emf of cell is very high then current in ammeter is very high result of this current the devices may get damaged. If devices are ideal that means resistance of voltmeter is infinity. so that current in the circuit is zero. Therefore ammeter will read zero reading and voltmeter will read the emf of cell.
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