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Write Down the Formula Which Relates Electric Charge, Time and Electric Current

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प्रश्न

 Write down the formula which relates electric charge, time and electric current

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उत्तर

If a charge of Q coulombs flows through a conductor in time t seconds, the magnitude, I of the electric current flowing through it is given by: 

`I=Q/t` 

 

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अध्याय 4: Electricity - Exercise 2

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लखमीर सिंग Physics [English] Class 10
अध्याय 4 Electricity
Exercise 2 | Q 19.1

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संबंधित प्रश्न

Define the unit of current.


Draw the electrical symbols of the following components and state its use:

Ammeter.


Which particles constitute the electric current in a metallic conductor?


Which of the following equation shows the correct relationship between electrical unit? 

1A = 1C/s or 1c= 1A/s 


Ten bulbs are connected in a series circuit to a power supply line. Ten identical bulbs are connected in a parallel circuit to an identical power supply line. 

(d) Which circuit would have less current in it?

 


The lamps in a house hold circuit are connected in parallel because:

(a) this way they required less current
(b) if one lamp fails the others remain lit
(c) this way they require less power
(d) if one lamp fails the other also fail


Which effect of current is utilised in an electric light bulb?


State the law which relates the current in a conductor to the potential difference across its ends.

Name the physical quantity which is measured by an ammeter.

How many electrons are present in 1 C?

A 200 v electric transfer draws an electric current of 11 A. What is its electrical resistance?

Are switches connected in the neutral or live wire?

Two resistors P and Q of the same material and length but of different thickness are connected in parallel to a battery. The cross- sectional area of P is twice that of Q. What is the ratio of
(a) The resistance of P to the resistance of Q?
(b) The current in P to the current in Q?


State the S.I. units of electrical power.


An electric bulb is rated at 220 V, 100 W.

  1. What is its resistance?
  2. What safe current can be passed through it?

My mother was operating washing machine on Sunday morning. Suddenly, she saw a spark coming out of the electric board and the electric current in the house failed. An electrician was called to look into the matter. What should he have noticed.


Answer the following question.
An electric lamp of resistance 20 Ω and a conductor of resistance 4 0 are connected to a 6 V battery as shown in the circuit. Calculate: 

(a) the total resistance of the circuit,  

(b) the current through the circuit, 

(c) the potential difference across the  (i) electric lamp and (ii) conductor, and

(d) power of the lamp.


Match the following:

1. 1 mA a. series
2. 1 pA b. ohmmeter
3. Ammeter  c. 10-6 ampere
4. Electrical resistivity d. 10-3 ampere

Electric current passes through a metallic conductor due to the movement of ______.


What is the SI unit for the current?


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