Time rate of work done or electrical energy developed or consumed by a generator or appliance, is called electrical
Time rate of work done or electric energy develop or consumed by generator or appliance, is called electric power. We know, that the rate of work done per unit Time is known as power. So, here is some change ie., in terms of electricity Time rate of work done is known as electric power.
The power of the battery in the resistor appears as
Firstly, you get shorter battery life simply because your average energy consumption is increased over the peak period.A battery generates power when it powers a light bulb. It dissipates power when it is being charged.
In series combination of electrical appliances, total electrical power
Power is directly proportional to the potential difference and potential difference is directly proportional to the Current. In a series combination, Resistance is increased and thus the flow of current decreases Power is directly proportional to current therefore power decreases.
The rate of flow of an electric charge is known as :
As more and more resistors are added in parallel to a circuit, the equivalent resistance of the circuit decreases and the total current of the circuit increases.Therefore the power decreases.
Power voltage rating of an electric bulb is 100 W 200 V. Current drawn by it will be
Power = voltage * current
Here, power = 100 W, voltage = 200 V
P = V*I
Therefore, 100 = 200 * I
I = 100/200 A
I = 0.5 A
The total work done by an electrical appliance during its operation, is called electrical
Energy is the ability to do work, where work is done when a force moves an object. We need and we use energy every day, and energy is available in all different forms. Electrical energy is energy that is stored in charged particles within an electric field.
The unit of electrical energy is
Joule is the unit of work or energy; it is equal to the work done by a force of one newton acting through one meter. It was named in honor of the English physicist James Prescott Joule. It equals 107 ergs, or approximately 0.7377 foot-pounds. In electrical terms, the joule equals one watt-second—i.e., the energy released in one second by a current of one ampere through a resistance of one ohm.
Number of joules in 1 kWh is
When electric current flows through a conductor the conductor becomes
When electric current flows through a conductor
Heating of a current carrying conductor is due to
When electrons starts drifting into lower potential to higher potential then it get collision with their atoms. Due to which electron loses their kinetic energy and cause heat effect of current.
Out of the following which is an insulating material ?
Rate of energy transferred if a current of 0.5 A passes through a bulb connected across a battery of 6 V for 20 s is
Energy = v × i × t = 6 × 0.5 × 20 = 60J
In electric heating appliances the material of the heating element is
In domestic electric circuits, the cheapest appliance used is
In domestic electric circuits, the cheapest appliance used is fuse bulb .
An electric fuse is used as a safety device for the protection of electric circuits and appliances due to short - Circuiting or overloading of the electric circuits.
An ammeter has 20 divisions between mark 0 and mark 2 on its scale. The least count of the ammeter is
20 Divisions are equal to the 2A
1 division is equal to 2/20 = 0.1 A
therefore Least count of the Ammeter is 0.1 A.
In a voltmeter, there are 20 divisions between the 0 mark and 0.5 V mark. The least count of the voltmeter is
Least count L. C = 0.5 / No. of divisions
Least count of voltmeter L. C = 0.5/20
Which two circuit components are connected in parallel in the following circuit diagram ?
We know that the voltmeter is always connected in parallel across the resistance to measure voltage across the resistance. So, option ( b) is the correct answer.
Resistance of a wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is
Resistance ‘R = 6ohm’ is related to length ‘L’, area of cross-section ‘A’ and resistivity ‘ρ’ as,
R = ρL/A
When L is doubled ,
As we know that the volume of the wire remains same.
old volume = new volume
AL = A'L' ....(i) ( as volume = area x length )
L' = 2L
So, from (i)
A' = A/2
So the new resistance is ,
R' = ρL'/A'
R' = ρ(2L)/(A/2) = 4 (ρL/A)
=> R' = 4R
thus, correct answer is option (b).
Electric pressure is also called
I = 180mA = 180 /1000 =b0.18A and the V = 1.8V.
So, R= V / I = 0.181.8 = 10 ohms.
Hence, the resistance in the circuit is 10 ohms.
Substances whose atoms have no free electrons, are called
Substances whose atoms have only few free electrons, are called
A neutral body has
Electrically neutral atoms simply possess the same number of electrons as protons. This gives the object a balance of both type of charge.
A body gets positively charged by losing
A body gets negatively charged by gaining
Electrons have negative energy. When the number of electrons and protons are equal the charge is neutral but if electron is added to it then the negative charge dominates which gives it negative charge.