Electrical resistivity of a given metallic wire depends upon

If the current I through a resistor is increased by 100%, the increase in power dissipated will be

In an electrical circuit two resistors of 2\(\Omega \) and 4\(\Omega \) respectively are connected in series to a 6 V battery. The heat dissipated by the 4\(\Omega \) resistor in 5s will be

An electric kettle consumes 1 Kw of electric power when operated at 220 V. A fuse wire of what rating must be used for it?

Unit of electric power may also be expressed as

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?

Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combination would be

In the following circuits, heat produced in the resistor or combination of resistors connected to a 12 V battery will be

Identify the circuit in which the electrical components have been properly connected.

The proper representation of series combination of cells obtaining maximum potential is

What does an electric current mean?

Define the unit of current.

What is meant by saying that the potential difference between two points is 1 V?

On what factors do the resistance of a conductor depend?

What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?

What determines the rate at which energy is delivered by a currect?

Should the resistance of an ammeter below or high? Give reason.

Three incandescent bulbs of 100 W each are connected in series in an electric circuit. In another circuit, another set of three bulbs of the same voltage are connected in parallel to the same source.
(a) Will the bulb in the two circuits glow with the same brightness? Justify your answer.
(b) Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason

State Ohm's law? How can it be verified experimentally? Does it hold good under all conditions? Comment

How will you infer with the help of an experiment that the same current flows through every part of the circuit containing three resistances in series connected to a battery?

How will you conclude that the same potential difference exist across three resistors connected in a parallel arrangement to a battery?

Find out the following in the electric circuit given in Figure
(a) Effective resistance of two 8 \(\Omega\) resistors in the combination
(b)Current flowing through 4 \(\Omega\) resistor
(c) Potential difference across 8 \(\Omega\) resistance
(d) Power dissipated in 4 \(\Omega\) resistor
(e) Difference in ammeter readings, if any.