Physics
The diagram shows wiring in a meter room of a building.
(a) What is the current rating of device X?
(b) What is the difference between the switch Z shown in the diagram and the switches you use to operate different appliances at home?
(c) What is the unit of the physical quantity displayed in Y?
Answer
(a) X is a company fuse or pole fuse. It does not have a fixed current rating. It depends on the load capacity of the connection.
(b) Z can connect & disconnected live and neutral line simultaneously. But the switch which is used to operate domestic appliances connect & disconnected live line only.
(c) Unit is kWh.
Related Questions
A submarine in the sea, sends ultrasonic ping and a stopwatch is started simultaneously. The stopwatch stops on receiving the reflected wave from an obstacle and reads 1 minute 40 seconds. Calculate the distance of the obstacle from the submarine (Speed of sound in water 1500 ms-1)
The diagrams given below show two sound boxes A and B with wires of same length (l) and tension (10 kgf) but different cross-sectional areas. Simultaneously, vibrating tuning forks of frequency 300 Hz are placed on the boxes A and B. The paper rider falls off in case of B but not in case of A.
(a) Name and explain the phenomenon responsible for the falling off of the paper rider in B.
(b) The wire A resonates with a tuning fork of frequency ‘f’. Is ‘f’ greater than, less than or equal to 300 Hz? Justify your answer.
Study the diagram given below and answer the questions that follow :
(a) Name the process depicted in the diagram.
(b) What is the value of X?
(c) Identify Y, the missing product of the reaction.
Three identical bulbs B1, B2 and B3 each of power rating 18 W, 12 V are connected to a battery of 12 V.
(a) Calculate :
- the resistance of each bulb
- the current drawn from the cell
(b) If the bulb B3 is removed from the circuit, then will the brightness of the bulb B1 increase, decrease or remain the same?