Advertisements
Advertisements
Question
Advertisements
Solution
Features which provide greater efficiency to a transformer are:
(i) The core of the transformer is laminated which prevents the formation of eddy currents.
(ii) A closed soft-iron core is used which reduces the magnetic field link loss and hysteresis loss.
APPEARS IN
RELATED QUESTIONS
What is the conventional direction of the flow of electric current? How does it differ from the direction of flow electrons?
A car headlight bulb working on a 12 V car battery draws a current of 0.5 A. The resistance of the light bulb is:
(a) 0.5 Ω
(b) 6 Ω
(c) 12 Ω
(d) 24 Ω
If the lamps are both the same in the figure given below and if A1 reads 0.50 A, what do A2, A3, A4 and A5 read?
Christmas tree lamps are usually wired in series. What happens if one lamps breaks?
Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in parallel to the electric supply at 220 V.
(a) Draw a circuit diagram to show the connections.
(b) Calculate the current drawn from the electric supply.
(c) Calculate the total energy consumed by the two lamps together when they operate for one hour.
Define the following:
Electromotive force
Find the effective resistance in the following circuit diagrams (Fig.):
State whether the current is a scalar or vector?
What are the effects of electric current?
