Current electricity questions with answers
89 multiple-choice questions. Open any question for its answer and explanation.
- What will be energy used by the battery if the battery has to drive 6.28 x 1018 electrons with potential difference of 20 V across the terminal?
- In the case of direct current
- An open resistor, when checked with an ohmmeter reads
- The resistance of a conductor varies inversely as
- Which of the following materials has a negative temperature coefficient of resistance?
- Conductance is reciprocal of
- With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals
- Ohm's law is not applicable to
- The number of electrons in the outer most orbit of carbon atom is
- Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners?
- Nichrome wire is an alloy of
- When electric current passes through a metallic conductor, its temperature rises. This is due to
- Switching of a lamp in house produces noise in the radio. This is because switching operation produces
- The thickness of insulation provided on the conductor depends on
- What is the answer to this question? The resistance of a few meters of wire conductor in closed electrical circuit is
- When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will
- Electric current passing through the circuit produces
- Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct?
- All of the following are equivalent to watt except
- A thermistor has
- Varistors are
- If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes
- The property of a conductor due to which it passes current is called
- A field of force can exist only between
- In a series circuit with unequal resistances