Derive the expression for the heat produced due to a current 'I' flowing for a time interval 't' through a resistor 'R' having a potential difference 'V' across its ends. With which name is this relation known ?

The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below_

Write the formula for the amount of the heat produced in a resistor when current flows through it for time. Give three applications of heating effect of current.

Two wires A and B are of same metal, have the same area of cross-section and have their lengths in the ratio 2 : 1. What will be the ratio of currents flowing through them respectively when the same potential difference is applied across the length of each of them ?

Two cells of emf 2V and 4V and internal resistance 1Omega and 2Omega respectively are connected in parallel so as to send the current in the same direction through an external resistance of 10Omega. Find the potential difference across 10Omega resistor.

Four students plot graphs between V and I, showing dependence of current I on potential difference V across a resistor, as shown The correct graph is

Write an expression for the amount of heat produced in a wire of resistance R and carrying a current I for time. An electric heater of resistance 10 ohm draws 15 A from the service mains for 2 hours. Calculate the heat developed in the heater?

Write an expression for the amount of heat produced in a wire of resistance R and carrying a current I for time. An electric heater of resistance 10 ohm draws 15 A from the service mains for 2 hours. Calculate the power of the heater.

A current of 1 ampere flows in series circuit contains an electric lamp and a conductor of 5 ohm when connected to a 10V battery. Calculate the resistance of the electric lamp. Now if a resistance of 10 ohm is connected in parallel with this series combination, what change in current flowing through 5 ohm conductor and potential difference across the lamp will take place? Give reason.