﻿ Calculate the current drawn by the primary of a transformer which steps down 200 V to 20 V to operate a device of resistance . Assume the efficiency of transformer to be 80%.   : Kaysons Education

# Calculate The Current Drawn By The Primary Of A Transformer Which Steps Down 200 V To 20 V To Operate A Device Of resistance . Assume The Efficiency Of Transformer To Be 80%.

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## Question

### Solution

Correct option is

0.125 A

The efficiency of the transformer is

.

.

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Q8

A town situated 20 km away from a power plant generating power at 440 V, requires 600 kW of electric power at 200 V. The resistance of the two-wire line carrying power is  /km. The town gets power from the line through a 3000-220 V step-down transformer at a sub-station in the town. Estimate the line power loss as heat.

Q9

The ratio of the number of turn in the primary and the secondary coil of a step-up transformer is 1 : 200. It is connected to A-C mains of 200 V. Calculate the voltage developed in the secondary. Determine the current in the secondary, when a current of 2.0 A flows through the primary.

Q10

A transformer of 100% efficiency has 200 turns in the primary and 40000 turns in the secondary. It is connected to a 220-V main supply and the secondary feeds to a  resistance. Calculate the output potential difference per turn and the power delivered to the load.