Current Electricity questions
395 published questions with worked solutions.
- A galvanometer of resistance G, is shunted by a resistance S ohm. To keep the main current in the circuit unchanged, the...
- The emf and the current of an a.c. circuit are E=5 t volt and I=2 t amp resp., the power consumed in the circuit is
- In an A.C. circuit, the flowing current is I = 5 (100t - 2 ) A and the potential difference is e = 200 (100t) V. The power...
- In an A.C. circuit, the instantaneous values of e. m. f. and current are e=200 314t volt and I= (314t+ 3 ) ampere. The average...
- If a current I given by I_0 ( t- 2 ) flows in an A.C. circuit across which an A.C. potential of e=e_0 t has been applied, then...
- A coil of resistance R and inductance L is connected to a battery of emf e volt. The final current in the coil is
- The electron in a hydrogen atoms circle around to proton in 1.6 10^ -18 second, the equivalent current due to motion of the...
- The electron in first orbit of hydrogen with velocity 2.18 10^ 6 m/s. If radius of first orbit is 0.53 Å, then orbital current is
- The ratio of electrons and holes current in the semiconductor is 7:4 and the ratio of drift velocities of electrons and holes is...
- A zener diode has a breakdown voltage of 5V with a maximum power dissipation of 240 mW. The maximum current the diode can handle...
- The reverse currents corresponding to reverse voltages 10 V and 20 V are 25 and 50 respectively. The reverse resistance is
- In a N-P-N transistor about 10^ 10 electrons enter the emitter in 2 , when it is connected to a battery. Then I_E = ____ .
- Combination of solar cells designed to increase the electric power output is called
- A zener diode has a breakdown voltage of 5 V with a maximum power dissipation of 240 mW. The maximum current the diode can handle...
- A car battery of emf 12 V and internal resistance 5 10^ -2 , receives a current of 60 A from external source, then terminal...
- Two bulbs of (40 W, 200 V), and (100 W, 200 V). Then correct relation for their resistance :
- The resistance of each arm of the wheat stone bridge is 10 ohm. A resistance of 10 ohm is connected in series with galvanometer...
- Specific resistance of a conductor increases with :
- Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220...
- An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the water in the kettle boils in...
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