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प्रश्न
Name the device used these days in place of electric fuses in electrical circuits.
What device could be used in place of the fuses?
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उत्तर
Miniature circuit breaker (MCB)
संबंधित प्रश्न
What do the following symbols mean in circuit diagrams?
Draw circuit symbols for
an open switch
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.
Tell the odd one out. Give a proper explanation.
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?
A battery is to be formed by joining 3 dry cells with connecting wires. Show how will you connect the wires by drawing a diagram.
Answer the following question.
With the help of a suitable circuit diagram prove that the reciprocal of the equivalent resistance of a group of resistances joined in parallel is equal to the sum of the reciprocals of the individual resistances.
What do you understand by the open electric circuit?
Draw a neat diagram showing a open electric circuit.
Explain the following:
Open circuit
In any electric circuit, when the switch is on and the current flows through it why do the wire, switches, bulb or devices become hot?
Write scientific reason.
It is beneficial to carry electrical energy in AC form as it is carried over long distances.
In the circuit diagram below, 10 units of electric charge move past point x every second What is the current in the circuit ______.
In the circuit shown, which switches (L,M or N) must be closed to light up the bulb?
Higher Order Question
A student made a circuit by using an electric cell, a switch, a torch bulb (fitted in the bulb holder), and copper connecting wires. When he turned on the switch, the torch bulb did not glow at all. The student checked the circuit and found that all the wire connections were tight.
- What could be the possible reason for the torch bulb not glowing even when the circuit appears to be complete?
Three bulbs are connected end to end from the battery. This connection is called _______.
When a circuit is open, _____ cannot pass through it.
Explain about domestic electric circuits. (circuit diagram not required)
A device that is used to break an electric circuit is called ______.
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.
In an electric circuit, the current starts from ______.
Our body is a ______ of electricity.
Draw the symbols of the following circuit components.
Switch in off position
In the above circuit, if the current reading in the ammeter A is 2A, what would be the value of R1?
Will the bulb glow in the circuit shown in the following figure? Explain.
Name the device which is used to measure the strength of the electric current in an electric circuit.
