Which of the following is a unit of electric current?
The potential difference between two points is measured in:
Ohm's law relates current, voltage and resistance as:
What is the SI unit of electrical resistance?
Which of the following factors affects the resistance of a conductor?
Specific resistance (resistivity) of a wire depends upon:
The SI unit of resistivity is:
When resistors are connected in series, the total resistance is:
When resistors are connected in parallel, the equivalent resistance:
Electric power is given by the formula:
Commercial unit of electrical energy is:
1 kilowatt-hour (kWh) is equal to how many joules?
Joule's law of heating states that heat produced in a resistor is proportional to:
The device used to measure electric current in a circuit is:
An ideal ammeter should have:
An ideal voltmeter should have:
Conventionally, the direction of electric current is taken as:
The electric charge on one electron is approximately equal to:
Why are copper and aluminium wires usually employed for electricity transmission?
The filament of an electric bulb is made of tungsten because:
A piece of wire of resistance $R$ is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is $R'$, then the ratio $R/R'$ is:
Which of the following terms does not represent electrical power in a circuit?
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed by it is:
Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then in parallel in a circuit. The ratio of heat produced in series and parallel combinations would be:
The unit of resistivity of a material is: