Advertisements
Advertisements
Question
The unit of electrical power is _______.
Options
volt
watt
joule
ampere
Advertisements
Solution
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.
RELATED QUESTIONS
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?
What do the following symbols mean in circuit diagrams?

Draw circuit symbols for variable resistance
Draw circuit symbols for
a battery of three cells
Draw circuit symbols for
an open switch
Tell the odd one out. Give a proper explanation.
Explain the construction and working of the following. Draw a neat diagram and label it.
Electric motor
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.
Write the condition required for a circuit to be a closed circuit.
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 |
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.
Explain the following:
Open circuit
What is open 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?
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.
What is the use of earthing wire?
Flow of electricity through a closed circuit is _____.
Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage.
What is electric circuit?
In a simple circuit, why does the bulb glow when you close the switch?
The wiring in a house consists of ______ 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?
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.
When an electric current flows through a copper wire AB as shown in the following figure, the wire


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 |
What are the essential components of an electric circuit?
In which of the following circuits A, B and C given in the following figure, the cell will be used up very rapidly?

Boojho has a cell and a single piece of connecting wire. Without cutting the wire in two, will he be able to make the bulb glow? Explain with the help of a circuit diagram.
A complete circuit is left on for several minutes, causing the connecting copper wire to become hot. As the temperature of the wire increases, the electrical resistance of the wire
Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage.
