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प्रश्न
Find the odd one out and justify it.
Fuse wire, M.C.B., Rubber Gloves, Generator
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उत्तर
Generator.
All others are related to safety measures to avoid mishap due to electricity.
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संबंधित प्रश्न
Redraw the circuit of question 1, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across the 12 Ω resistors. What would be the readings in the ammeter and the voltmeter?
Draw circuit symbols for
fixed resistance
Draw a circuit diagram to show how 3 bulbs can be lit from a battery so that 2 bulbs are controlled by the same switch the third bulb has its own switch.
Explain the construction and working of the following. Draw a neat diagram and label it.
Electric motor
Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins?
Two tungsten bulbs of power 50 W and 60 W work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor?
The following figure shows the symbols for components used in the accompanying electrical circuit. Place them at proper places and complete the circuit.
Which law can you prove with the help of above circuit?
In an electric circuit, electron flow a from of point of ______ potential to the point of ______ potential.
Match the column ‘A’ with column ‘B’.
|
Column ‘A’
|
Column ‘B’ |
|
(1) Eka - boron
|
(a) Germanium
|
|
(2) Eka - Aluminium
|
(b) Scandium
|
|
(3) Eka - Silicon
|
(c) Gallium |
Draw a neat diagram showing a closed electric circuit.
Draw a neat diagram showing a open electric circuit.
Explain the following:
Open circuit
The unit of electrical power is _______.
How much is the potential difference between live and neutral wires?
Increasing the current passing through the wire decreases the magnetic field intensity.
The switch is used to close or open an electric circuit.
Rahul wants to make an electric circuit. He has a bulb, two wires, a safety pin, and a piece of copper. He does not have any electric cell or battery. Suddenly he gets some idea. He uses lemon instead of a battery and makes a circuit. Will the bulb glow?
Study the three electric circuits below. Each of them has a glass rod (G), a steel rod (S), and a wooden rod (W).
In which of the electric circuits would the bulb not light up.
Which of the following a simple circuit must-have?
Three bulbs are connected end to end from the battery. This connection is called _______.
Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage.
What is electric circuit?
Explain about domestic electric circuits. (circuit diagram not required)
A device that is used to break an electric circuit is called ______.
In a circuit, if the key is in open (off) condition, then electricity will not flow.
In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?
Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2 Ω in series with a combination of two resistors (4 Ω each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the 2 Ω resistor be the same as that across the parallel combination of 4 Ω resistors? Give reason.
Our body is a ______ of electricity.
In an electric circuit a fuse is a ______ ______ to prevent possible fire.
In the above circuit, if the current reading in the ammeter A is 2A, what would be the value of R1?
Match the following
| 1. | Insulator | a. | Coulomb |
| 2. | Conductor | b. | Electric circuit |
| 3. | Closed path | c. | Copper |
| 4. | Electric charge | d. | Rubber |
Paheli is running short of connecting wires. To complete an electric circuit, she may use a ______.
Paheli connected two bulbs to a cell as shown in the following figure.
She found that filament of bulb B is broken. Will the bulb A glow in this circuit? Give reason.
Write a short note on the different electrical circuits.
An electric motor rated 1100 W is connected to 220 V mains. Find:
- The current drawn from the mains,
- Electric energy consumed if the motor is used for 5 hours daily for 6 days.
- Total cost of energy consumed if the rate of one unit is 5.
