Advertisements
Advertisements
प्रश्न
Nowadays MCBs are used in homes, for stop the current in the circuit which suddenly increases.
Advertisements
उत्तर
- Electrical appliances used in homes like geyser, heater, motor, oven, washing machine, etc. have high power consumption.
- If such appliances are connected simultaneously, a large amount of current flows in the circuit.
- This current may exceed permissible value and cause overloading.
Hence, nowadays MCBs are used in homes, to stop the current in the circuit which suddenly increases due to overloading.
APPEARS IN
संबंधित प्रश्न
Draw circuit symbols for
a cell
Draw circuit symbols for
A closed switch
Draw the labelled diagram of an electric circuit comprising of a cell, a resistance, an ammeter, a voltmeter and a closed switch (or closed plug key). Which of the two has a large resistance : an ammeter or a voltmeter?
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?
Resistances R1, R2, R3 and R4 are connected as shown in the figure. S1 and S2 are two keys. Discuss the current flowing in the circuit in the following cases.
- Both S1 and S2 are closed.
- Both S1 and S2 are open.
- S1 is closed but S2 is open.
The accompanying figure shows some electrical appliances connected in a circuit in a house. Answer the following questions.
- By which method are the appliances connected?
- What must be the potential difference across individual appliances?
- Will the current passing through each appliance be the same? Justify your answer.
- Why are the domestic appliances connected in this way?
- If the T.V. stops working, will the other appliances also stop working? Explain your answer.
Explain the following:
Open circuit
Explain the following:
Closed circuit
What is open circuit?
Find the odd one out and give its explanation.
What is the potential difference?
Draw the circuit diagram for the series connection.
In which among the following circuits does the bulb glow?
In the circuit diagram below, 10 units of electric charge move past point x every second What is the current in the circuit ______.
Draw the circuit diagram for the following series connection
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.
_____ has a thin metallic filament that melts and breaks the connection when the circuit is overheated.
State whether true or false. If false, correct the statement.
Ammeter is connected in parallel in any electric circuit.
In a simple circuit, why does the bulb glow when you close the switch?
When a circuit is open, _____ cannot pass through it.
The wiring in a house consists of ______ circuits.
What is the role of the earth wire in domestic circuits?
What are the types of electric circuits?
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?
A child has drawn the electric circuit to study Ohm’s law as shown in Figure. His teacher told that the circuit diagram needs correction. Study the circuit diagram and redraw it after making all corrections.
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 ______.
When an electric current flows through a copper wire AB as shown in the following figure, the wire
Three bulbs A, B, C are connected in a circuit as shown in the following figure. When the switch is ‘ON’
Our body is a ______ of electricity.
The ______ is a species of fish that can give electric shocks of up to six hundred fifty watts of electricity.
In which of the following circuits A, B and C given in the following figure, the cell will be used up very rapidly?
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.
How is Joule's law effect useful in electric circuits where fuse is used as a safety device?
