A step up transformer is used on 120 V line to provide a potential difference of 2400 V.If the primary has 75 turns,how many turns must the secondary have ?

A step down transformer of efficiency 80% is used on a 1000V line to deliver a current of 20A at 120V at the secondary coil. What is the current drawn from the line?

In a step up transformer, the input voltage is 300 V and the output voltage is 15 kV. Then the ratio of the number of turns in the primary to that in the secondary is

The resistance of a device is 100 Omega . Find the current through it when a potential difference of 20 V is applied across it. To pass the same current through a device having resistance 200 Omega , how much potential difference should be applied across it?

The transformer ratio of the step down transformer is 2 : 5 . Alternating voltage of 180 V amplitude is supplied to the primary. Calculate the r.m.s. value of secondary voltage

A step down transformer has 800 turns in the primary. The supply voltage is 240 V. If the transformer is to be used to light a 6V lamp, what should be the number of turns in the secondary?

A transformer is used to reduce the mains supplyof 220V to 22V.If the currents in the primary and secondary are 2A and 15A respectively, then the efficiency of the transformer is

Read the given passage and answer the following questions: The home electrical connection consists of 'live','neutral' and 'earth wires. The 'live' and the 'neutral' wires have potential difference of 220 v. The earth ire is connected to ground. Due to a fault in the equipment or if the plastic coating on the 'live ' and the neutral wires gives away the two wires come in contact with each other and a large current flows through it producing heat . If any inflammable material (such as wood , cloth , plastic etc). exists around that place it can catch fire. Therefore a fuse wire is used as a precautionary measures. Name the two wires having potential difference of 220 v.

Read the given passage and answer the following questions: The home electrical connection consists of 'live','neutral' and 'earth wires. The 'live' and the 'neutral' wires have potential difference of 220 v. The earth ire is connected to ground. Due to a fault in the equipment or if the plastic coating on the 'live ' and the neutral wires gives away the two wires come in contact with each other and a large current flows through it producing heat . If any inflammable material (such as wood , cloth , plastic etc). exists around that place it can catch fire. Therefore a fuse wire is used as a precautionary measures. What is short circuit?

Read the given passage and answer the following questions: The home electrical connection consists of 'live','neutral' and 'earth wires. The 'live' and the 'neutral' wires have potential difference of 220 v. The earth ire is connected to ground. Due to a fault in the equipment or if the plastic coating on the 'live ' and the neutral wires gives away the two wires come in contact with each other and a large current flows through it producing heat . If any inflammable material (such as wood , cloth , plastic etc). exists around that place it can catch fire. Therefore a fuse wire is used as a precautionary measures. Write the function of a fuse?

A transformer is used to reduce the main supply of 220 V to11 V. If the current in the primary and secondary coils are 5A and 90 A respectively, the efficiency of transformer is