Physics
Observe the given circuit diagram and answer the questions that follow:
(a) Calculate the resistance of the circuit when the key K completes the circuit.
(b) Calculate the current through 3Ω resistance when the circuit is complete.
Related Questions
Purvi's friend Tim wants to connect a fuse to his oven. He wants to control the oven from two different locations. Shown below is his circuit diagram.
(a) Which one of the two, A or B should be a live wire?
(b) In the event of an overload, will the fuse serve its purpose?
(c) What is the meaning of the statement that the bulb is rated 600W, 220 V?
(a) Copy and complete the following nuclear reaction.
22286Rn ⟶ 21884Po + _—X
(b) What will be the effect on the radiation X, emitted in the above reaction when it is allowed to pass through an electric field?
What mass of ice at 0°C added to 2.1 kg water, will cool it down from 75°C to 25°C?
Given: Specific heat capacity of water = 4.2 Jg-1 C-1
Specific latent heat of ice = 336 Jg-1
The diagram below shows a cooling curve for a substance:
(a) State the temperatures at which the substance condenses.
(b) The temperature range in which the substance is in liquid state.
(c) Why do we prefer ice to ice-cold water for cooling a drink?