Advertisements
Advertisements
प्रश्न
For a heater rated at 4 kW and 220 V, calculate:
(a) the current,
(b) the resistance of the heater,
(c) the energy consumed in 2 hours, and
(d) the cost if 1 kWh is priced at Rs 4.60.
Advertisements
उत्तर
Given:
V=220V
`P=4KW=4xx10^3W`
(a) `I=P/V=(4xx10^3)/220=18.18A`
(b) `R=V/I=220/18.18=12.1 I `
(c)Energy consumed in two hours,`E=Pxxt`
`=4KWxx2h`
`=8Kwh`
(d) cost of 1kwh= Rs 4.6
Total cost =Energy consumed x price
= 8 x 4.6
= Rs 36.80
APPEARS IN
संबंधित प्रश्न
Why are metals good conductors of electricity whereas glass is a bad conductor of electricity? Give reason?
Three 2 V cells are connected in series and used as a battery in a circuit.
How many joules of electrical energy does 1 C gain on passing through (i) one cell (ii) all three cells?
By what name is the physical quantity coulomb/second called?
A p.d. of 6 V is applied to two resistors of 3 Ω and 6 Ω connected in parallel. Calculate:
(a) the combined resistance
(b) the current flowing in the main circuit
(c) the current flowing in the 3 Ω resistor.
Using the circuit given below, state which of the following statement is correct?
(a) When S1 and S2 are closed, lamps A and B are lit.22
(b) With S1 open and S2 closed, A is lit and B is not lit.
(c) With S2 open and S1 closed A and B are lit.
(d) With S1 closed and S2 open, lamp A remains lit even if lamp B gets fused.
Tick(✓) the correct choice in the following:
When the length of a conductor is doubled the resistance of the conductor
will
Two resistors P and Q of the same material and length but of different thickness are connected in parallel to a battery. The cross- sectional area of P is twice that of Q. What is the ratio of
(a) The resistance of P to the resistance of Q?
(b) The current in P to the current in Q?
My mother was operating washing machine on Sunday morning. Suddenly, she saw a spark coming out of the electric board and the electric current in the house failed. An electrician was called to look into the matter. What should he have noticed.
State the condition when it is advantageous to connect cells in parallel.
Give the electric current unit.
Conventionally, the direction of the current is taken as:
A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross section of the filament in 16 seconds would be roughly
1020 electrons, each having a charge of 1.6 x 10-19 C, flows in a circuit V is 0.1s. What is the current in ampere?
What does the direction of current convey?
