Name the device used to
decrease the voltage at the sub station for its supply.

Name the device used to increase the voltage at a generating station.

The device used to hear heartbeats is called a

(a) Draw the diagram of a device which is used to decrease high S voltage into a AC voltage and state its working principle. Write four sources of energy loss in this device. (b) A small town with a demand of 1200 kW of electric power at 220 V is situated 20 Km away from an electric plant generating power at 440V. The resistance of the two wire line carrying power is 0.5 Omega per km. The town gets the power from the line through a 4000-220 V step-down transformer at s sub-station in the town. Estimate the line power loss in the from of heat.

Modem is a device used for

A device used to measure very high temperature is

Name two devices which are used to measure the volume of an object.

Three devices used for measuring length

Name the device used to protect the electric circuits from overloading and short circuits.

Name the device used to protect the electric circuits from overloading and short circuits. On what effect of electricity does the above device work ?

What are the devices used by industries to control air pollution?