Advertisements
Advertisements
Question
Advertisements
Solution
Given , Np = 800 , Ns = 8,Ep = 220V, Es=?
We know that for a step-down transformer,
`"N"_"s"/"N"_"p" = "E"_"s"/"E"_"p"`
`"E"_"s" = "N"_"s"/"N"_"p" xx "E"_"p" = 8/800 xx 220 = 2.2 "V"`
APPEARS IN
RELATED QUESTIONS
The circuit diagram given below shows the combination of three resistors R1, R2 and R3:
Find :
(i) total resistance of the circuit.
(ii) total current flowing in the circuit.
(iii) the potential difference across R1.
Draw a circuit diagram showing two lamps, one cell and a switch connected in series.
How can you change the brightness of the lamp?
Complete the following sentence:
A fuse is connected in ........... with the ......... wire.
A current of 0.3 A is flowing through a branch of 6 Ω resistors in a junction as shown in fig. . Calculate the
(a) P.d. across the junction XY,
(b) Current flowing through 9Ω and 24Ω
( c) P.d. across 24 Ω resistor, and
( d) e.m.f. of the cell.
Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. The resistance of each heater
Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply of the energy supplied in kWh to the three heaters in 5 hours.
Match the following:
| 1. | 1 mA | a. | series |
| 2. | 1 pA | b. | ohmmeter |
| 3. | Ammeter | c. | 10-6 ampere |
| 4. | Electrical resistivity | d. | 10-3 ampere |
Problems for practice:
If 3A current flows through a circuit, then convert the current in terms of a milliampere.
