Advertisements
Advertisements
Question
Find the ratio of primary and secondary currents in terms of turn ratio in an ideal transformer.
Advertisements
Solution
According to law of conservation of energy,
Input electrical power = Output electrical power
EpIp = EsIs
`:.E_s/E_p=I_p/I_s`
`I_p/I_s=E_s/E_p=N_s/N_p`
`=>I_p/I_s=n`
APPEARS IN
RELATED QUESTIONS
Derive an expression for e.m.f. and current in terms of turns ratio
A power transmission line feeds input power at 2200 V to a step-down transformer with its primary windings having 300 turns. Find the number of turns in the secondary to get the power output at 220 V.
The primary coil of an ideal step-up transformer has 100 turns and the transformation ratio is also 100. The input voltage and power are 220 V and 1100 W, respectively. Calculate the
(a) number of turns in secondary
(b) current in the primary
(c) a voltage across secondary
(d) current in secondary
(e) power in secondary
Explain why an induced current must flow in such a direction so as to oppose the change producing it.
A transformer is designed to work from a 240 V a.c. mains and to give a supply of 8 V to ring a house bell. The primary coil has 4800 turns. How many turns will be in the secondary coil?
Can a transformer be used with direct current source? Give reason.
A transformer lowers e.m.f. 220 V to 12 volts. If the number of turns in primary are 8800, how many turns are in secondary coil?
For an ideal step-down transformer, the quantity which is constant for both the coils is ______.
Which among the following, is not a cause for power loss in a transformer?
An ideal transformer converts 220 V a.c. to 3.3 kV a.c. to transmit a power of 4.4 kW. If primary coil has 600 turns, then alternating current in secondary coil is ______.
