Current Electricity Set 3

In a thermo-couple, one junction which is at 0 and the othe at the emf is given by . The neutral temperature is given by

5 cells, each of emf and internal resistance are connected to an external circuit of resistance of Find the current through external circuit

Two heater wires of equal length are first connected in series and then in parallel. The ratio of heat produced in the two cases is

A combination of two resistance of 2 W and 2/3 W connected in parallel is joined across a battery of emf of 3 V and of negligible internal resistance. The energy given out per sec will be

When a piece of aluminium wire of finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become

In the given circuit, the potential of the point is

An electric fan and a heater are marked as and respectively. The resistance of the heater is

of current is passed through a metallic conductor. The charge flowing in one minute in coulomb will be

When the resistance of is connected at the ends of a battery, its potential difference decreases from to The internal resistance of the battery is

A wire has a resistance of 6. It is cut into two parts and both half values are connected in parallel. The new resistance is