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
Draw the electrical symbols of the following components and state its use
Wire crossing
Draw the electrical symbols of the following components and state its use:
Ammeter.
Three 2 V cells are connected in series and used as a battery in a circuit.
- What is the p.d. at the terminals of the battery?
- How many joules of electrical energy does 1 C gain on passing through
- one cell
- all three cells?
By what name is the physical quantity coulomb/second called?
In which direction does conventional current flow around a circuit?
Why should the resistance of:
an ammeter be very small?
(a) With the help of a circuit diagram, obtain the relation for the equivalent resistance of two resistances connected in parallel.
(b) In the circuit diagram shown below, find:
(i) Total resistance.
(ii) Current shown by the ammeter A
The lamps in a house hold circuit are connected in parallel because:
(a) this way they required less current
(b) if one lamp fails the others remain lit
(c) this way they require less power
(d) if one lamp fails the other also fail
In which of the following cases more electrical energy is consumed per hour?
(i) A current of 1 ampere passed through a resistance of 300 ohms.
(ii) A current of 2 amperes passed through a resistance of 100 ohms.
Name two devices which work on the heating effect of electric current.
60 joules of heat was dissipated in a resistor when 20 C flowed for 5 s. Calculate:
(a) P.d. across the resistor,
(b) Resistance of the resistor, and
(c) Average power dissipated in the resistor.
Define the term kilowatt - hour and state its value in S.I. unit.
State the conditions for the flow of charge in a circuit from one point to the other.
Kilowatt hour is the unit of
For current to flow, one needs art open circuit.
The number of electrons required to produce a total charge of 1.6 C is:
