Advertisements
Advertisements
प्रश्न
Name two effects produced by electric current.
Advertisements
उत्तर
The two effects produced by an electric current are:
(i) Heating effect
(ii) Chemical effect
APPEARS IN
संबंधित प्रश्न
Draw the electrical symbols of the following components and state its use:
Ammeter.
What actually travels through the wires when you switch on a light?
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.
Which effect of current is utilised in an electric light bulb?
In the network shown in the following adjacent Figure, calculate the equivalent resistance between the points.
- A and B
- A and C
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 a short piece of wire of high ......... and low
Tick(✓) the correct choice in the following:
The outer casing of an electric iron is generally connected to earth in order
to
Define the following:
Super conductors
In the circuit shown in fig. 6, find the reading of the ammeter A when the switch S is
(a) Opened.
(b) Closed.
An electric bulb is rated '100 W, 250 V'. How much current will the bulb draw if connected to a 250 V supply?
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i) The resistance of the wire, and
(ii) The heat energy produced in 1 minute.
True or False – If False give the correct answer
The representation of the electric current is A
MCB is used to protect household electrical appliances.
Problems for practice:
If 3A current flows through a circuit, then convert the current in terms of a milliampere.
The number of electrons constituting a 1-coulomb charge is ______.
