Advertisements
Advertisements
Question
If a charge of 420 C flows through a conducting wire in 5 minutes what is the value of the current?
Advertisements
Solution
The current flowing through the conducting wire is
`"I" = "Charge (Q)"/"Time (t)"`
⇒ `"I" = 420/(5 xx 60) = 1.4 "A"`
Hence, the current flowing through the wire is 1.4 A.
APPEARS IN
RELATED QUESTIONS
Fill in the blank:
To increase the effective resistance in a circuit the resistors are connected in _____________.
In which direction does conventional current flow around a circuit?
A Radio Set Draws a Current of 0.36 a for 15 Minutes. Calculate the Amount of Electric Charge that Flows Through the Circuit.
State the factors on which the strength of electric current flowing in a given conductor depends.
What happens to the other bulbs in a series circuit if one bulb blows off?
Consider the circuit given below:
(a) In which circuit are the lamps dimmest?
(b) In which circuit or circuits are the lamps of equal brightness to the lamps in circuit (i)?
(c) Which circuit gives out the maximum light?
Three resistors of 6.0 𝛀, 2.0𝛀 and 4.0𝛀 are joined to an ammeter A and a cell of e.m.f. 6.0 V as
shown in fig 8.52 Calculate:
(a) the effective resistance of the circuit and
(b) the reading of ammeter.
Complete the following sentence:
A fuse is connected in ........... with the ......... wire.
Complete the following sentence:
Fuse wire has a ............ Melting point and it is made of an alloy of ......... and if the current in a circuit rises too high, the fuse wire ...........
Tick(✓) the correct choice in the following:
Which of the following quantities has the same value for all electrical
appliances connected to the ring main circuit in a house?
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.

The following appliances are to be used on 240 V supply. Calculate the current used by each and say which fuse, 2 amp, 5 amp or 13 amp should be incorporated with each, (i) A television rated at 150 W, (ii) An electric iron rated at 750 W, (iii) An immersion heater rated at 3000 W, (iv) A hair dryer rated at 500 W. How much will it cost to run the television set for 100 days for an average of 4 hours a day at 60 paise per unit?
An electric kettle is rated 2.5 kW, 250 V. Find the cost of running the kettle for two hours at Rs. 5.40 per unit.
At the time of short circuit, the electric current in the circuit ______.
Answer the following question.
What is the function of a galvanometer in a circuit?
State expression for Cells connected in series.
Electric current passes through a metallic conductor due to the movement of ______.
