Advertisements
Advertisements
प्रश्न
If a charge of 420 C flows through a conducting wire in 5 minutes what is the value of the current?
Advertisements
उत्तर
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
संबंधित प्रश्न
Why should the resistance of:
a voltmeter be very large?
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
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
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.
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?
Draw a circuit diagram showing two electric lamps connected in parallel together with a cell and a switch that works both lamps. Mark an â’¶ on your diagram to show where an ammeter should be placed to measure the current.
The following table shows the current in Amperes and potential differences in Volts.
- Find the average resistance.
- What will be the nature of the graph between the current and potential difference? (Do not draw a graph.)
- Which law will the graph prove? Explain the law.
| V (volts) | I (amp) |
| 4 | 9 |
| 5 | 11.25 |
| 6 | 13.5 |
Calculate the amount of energy transferred by a 10 A electric current flowing through a resistor of 5 o for 15 minutes.
Find the effective resistance in the following circuit diagrams (Fig.):
Name the principle on which a transformer works.
State the S.I. units of electrical power.
State expression for Cells connected in series.
Which part of an electrical appliance is earthed?
The SI unit for electric current is the coulomb.
Electric current passes through a metallic conductor due to the movement of ______.
What is the SI unit for the current?
