Advertisements
Advertisements
Question
Which of the following equation shows the correct relationship between electrical unit?
1A = 1C/s or 1c= 1A/s
Advertisements
Solution
Because current, I = Q/t, the correct relationship is
`1A= (1C)/(1s)`
APPEARS IN
RELATED QUESTIONS
Draw the electrical symbols of the following components and state its use:
Ammeter.
Which of the following units could be used to measure electric charge?
(a) ampere
(b) joule
(c) volt
(d) coulomb
Three 2 V cells are connected in series and used as a battery in a circuit.
How many joules of electrical energy does 1 C gain on passing through (i) one cell (ii) all three cells?
What is the current in a circuit if the charge passing each point is 20 C in 40 s?
If the charge on an electron is 1.6 × 10−19 coulombs, how many electrons should pass through a conductor in 1 second to constitute 1 ampere current?
Which instrument is used to measure electric current? How should it be connected in a circuit?
V1, V2 and V3 are the p.ds. across the 1Ω, 2Ω and 3Ω resistors in the following diagram, and the current is 5 A.

Which one of the columns (a) to (d) shows the correct values of V1, V2 and V3measured in volts?
`V_1` `V_2` `V_3`
(a) 1.0 2.0 3.0
(b) 5.0 10.0 15.0
(c) 5.0 2.5 1.6
(d) 4.0 4.0 2.0
Draw a circuit diagram to show how two 4 V electric lamps can be lit brightly from two 2 V cells.
A cell supplies a current of 1.2 A through two 2 Ω resistors connected in parallel. When the resistors are connected in series, it supplies a current of 0.4 A. Calculate:
(i) the internal resistance and (ii) e.m.f. of the cell.
If a charge of 420 C flows through a conducting wire in 5 minutes what is the value of the current?
The diagram shows two ways of connecting three lamps P, Q and R to A.C. supply of 220 V.


State the S.I. units of electrical power.
An electric iron is rated 750 W, 230 V. Calculate the electrical energy consumed by the press in 16 hours.
An electrical gadget can give an electric shock to its user under certain circumstances. Mention any two of these circumstances.
______ is used to measure the electric current.
Kilowatt hour is the unit of
Name any two devices, which are working on the heating effect of the electric current.
Unit of electric power may also be expressed as
