Physics
The diagram shows a circuit with the key k open. Calculate:
(i) the resistance of the circuit when the key k is open.
(ii) the current drawn from the cell when the key k is open.
(iii) the resistance of the circuit when the key k is closed.
(iv) the current drawn from the cell when the key k is closed.
Related Questions
The melting point of naphthalene is 80°C and the room temperature is 30°C. A sample of liquid naphthalene at 100°C is cooled down to the room temperature. Draw a temperature time graph to represent this cooling. In the graph, mark the region which corresponds to the freezing process.
(i) Write one advantage of connecting electrical appliances in parallel combination.
(ii) What characteristics should a fuse wire have?
(iii) Which wire in a power circuit is connected to the metallic body of the appliance?
The diagram below shows a dual control switch circuit connected to a bulb.
(i) Copy the diagram and complete it so that the bulb is switched ON.
(ii) Out of A & B which one is the live wire and which one is the neutral wire?
(i) Define Calorimetry.
(ii) Name the material used for making a Calorimeter.
(iii) Why is a Calorimeter made-up of thin sheets of the above material answered in (ii) ?