Current Electri...

A student carries out an experiment and plots the V-I graph of three samples of nichrome wire
with resistances R1, R2 and R3 respectively (Figure.12.5). Which of the following is true?

Find the currents $$I_1$$ and $$I_2$$ for the circuit shown in given figure.

A potentiometer wire of length $$100 cm$$ has a resistance of $$10$$ ohm. It is connected in series with a resistance and an accumulator of emf $$2V $$ and of negligible internal resistance. A source of emf of $$10 mV$$ is balanced against a length of $$40 cm$$ of the potentiometer wire. What is the value of external resistance?

Which of the following statement is true regarding the Kirchoffs laws?

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?

Electrical resistivity of a given metallic wire depends upon:

A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of

When a wire of uniform cross-section a, length l and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be:

Combined resistance is the sum of separate resistances provided that the various conductors are connected in______ .

Two wires of resistance $$R_1$$ and $$R_2$$ are joined in parallel. The equivalent resistance of the combination is: