Current Electricity and Electrical InstrumentMedium
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.
Create a free account to view solution
View Solution FreeTopic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions
More Current Electricity and Electrical Instrument Questions
If the potential difference across the ends of a conductor is doubled, the energy loss becomes -If the potential differe...The potential difference between the terminals of a battery of emf 10 V and internal resistance 1Ω drops to 9.8 V w...An energy source will supply a constant current into the load of its internal resistance is...In fig. a network of currents is shown. The magnitude of currents is shown here. The current I will be :-...AB is a potentiometer wire of length 100 cm and its resistance is 10 ohm. It is connected in series with a resistance R ...