Advertisements
Advertisements
Question
Calculate the equivalent resistance between A and B in the adjacent diagram.
Advertisements
Solution
R1 = 3 + 2 = 5 ohm
R2 = 30 W
R3 = 6 + 4 = 10 ohm
`"R"_1 , "R"_2 and "R"_3 `are connected in parallel
`1/"R" = 1/"R"_1 + 1/"R"_2 + 1/"R"_3`
`=1/5+1/30+1/10=10/30`
R = 3 ohm
RELATED QUESTIONS
Draw the electrical symbols of the following components and state its use:
Ammeter.
What is the Flow of Charge Called?
Compare how an ammeter and a voltmeter are connected in a circuit.
If the current through a floodlamp is 5 A, what charge passed in 10 seconds?
(a) 0.5 C
(b) 2 C
(c) 5 C
(d) 50 C
State the factors on which the strength of electric current flowing in a given conductor depends.
A battery and three lamps are connected as shown:
Which of the following statements about the currents at X, Y and Z is correct?
(a) The current at Z is greater than that at Y.
(b) The current at Y is greater than that at Z.
(c) The current at X equals the current at Y.
(d) The current at X equals the current at Z.
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.
Unit of electric power may also be expressed as
