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
In which direction does conventional current flow around a circuit?
Compare how an ammeter and a voltmeter are connected in a circuit.
In 10 s, charge of 25 C leaves a battery, and 200 J of energy are delivered to an outside circuit a result.
What current flows from the battery?
A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.4 Ω, 0.5 Ω and 0.12 Ω. How much current would flow through the 12 Ω resistor?
The figure given below shows an electric circuit in which current flows from a 6 V battery through two resistors.
- Are the resistors connected in series with each other or in parallel?
- For each resistors, state the p.d. across it.
- The current flowing from the battery is shared between the two resistors. Which resistor will have bigger share of the current?
- Calculate the effective resistance of the two resistors.
- Calculate the current that flows from the battery.
You can given one hundred 1 Ω resistors. What is the smallest and largest resistance you can make in a circuit using these?
If you were going to connect two light bulbs to one battery, would you use a series or a parallel arrangement? Why? Which arrangement takes more current from the battery?
Which is the better way to connect lights and other electrical appliances in domestic wiring: series circuits or parallel circuits? why?
An electric bulb is rated as 10 W, 220 V. How many of these bulbs can be connected in parallel across the two wires of 220 V supply line if the maximum current which can be drawn is 5 A?
Which effect of current is utilised in an electric light bulb?
A wire of uniform thickness with a resistance of 27Ω is cut into three equal pieces and they are joined in parallel. Find the equivalent resistance of the parallel combination.
Electrical power P is given by the expression P = (Q × V) ÷ time
(a) What do the symbols Q and V represent?
(b) Express the power P in terms of current and resistance explaining the meanings of symbols used there in.
Answer the following question.
What is the function of a galvanometer in a circuit?
Which part of an electrical appliance is earthed?
Define an electric current.
Match the items in column-I to the items in column-II:
| Column - I | Column - II |
| (i) electric current | (a) volt |
| (ii) potential difference | (b) ohm meter |
| (iii) specific resistance | (c) watt |
| (iv) Electrical power | (d) joule |
| (v) electrical energy | (e) ampere |
