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प्रश्न
The unit of electrical power is _______.
विकल्प
volt
watt
joule
ampere
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उत्तर
The unit of electrical power is watt.
Explanation:
It is defined as 1 joule per second (1 W = 1 J/s). It represents the rate at which electrical energy is consumed or produced.
संबंधित प्रश्न
What do the following symbols mean in circuit diagrams?
Draw circuit symbols for
a cell
Draw circuit symbols for
A closed 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.
Explain with the help of a labelled circuit diagram how you will find the resistance of a combination of three resistors, or resistance R1, R2 and R3, joined in parallel. Also mention how you will connect the ammeter and the voltmeter in the circuit when measuring the current in the circuit and the potential difference across one of the three resistors of the combination.
How does the short circuit form?
Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins?
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.
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.
Write the condition required for a circuit to be a closed circuit.
Draw a neat diagram showing a closed electric circuit.
Explain the following:
Closed circuit
If you touch an electric wire carrying current you get a shock, but if on the same wire the birds sit they do not get any shock/current. Explain why?
What is the potential difference?
How much is the potential difference between live and neutral wires?
Right or wrong sentence.
Increasing the current passing through the wire decreases the magnetic field intensity.
The switch is used to close or open an electric circuit.
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 ______.
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 _______.
The rate of flow of electric charges in a circuit is called ______.
In a circuit, if the key is in open (off) condition, then electricity will not flow.
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.
When an electric current flows through a copper wire AB as shown in the following figure, the wire
Name the device used these days in place of electric fuses in electrical circuits.
Observe the circuit given:
1. Would any of the bulbs glow when the switch is in the ‘OFF’ position?
2. What will be the order in which the bulbs A, B, and C will glow when the switch is moved to the ‘ON’ position?
Paheli is running short of connecting wires. To complete an electric circuit, she may use a ______.
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.
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.
Set up the circuit shown in Figure again. Move the key to ‘ON’ position and watch carefully in which direction the compass needle gets deflected. Switch ‘OFF’ the current. Now keeping rest of the circuit intact, reverse the connections at the terminal of the cell. Again switch ‘on’ the current. Note the direction in which the needle gets deflected. Think of an explanation.
