Domestic Electric Circuits
Trending Questions
What is the function of an earth wire? Why is it necessary to earth metallic appliances?
Give three reasons why different electrical appliances in a domestic circuit are connected in parallel.
A household uses the following electric appliance
a. Refrigerator of rating 400w for 10hrs.
b. Two electric fans of rating 80w each for 12hrs each day.
c. 6 electric bulbs of rating 18w each for 6hrs each day.
Calculate the electric bill of the house for the month of June if the cost of per unit electrical energy is₹3.0
List the colours of the three wires in the cable connected to the plug of an electic iron.
- Red, black, green
- Red, blue, green
- Black, yellow, green
- Red, yellow, blue
Why are appliances connected in parallel in the household wiring system?
A transformer of frequency and input has an turn ratio. The frequency of the output is
An electric kettle for use in a 230 V supply is rated at 3000 W. For safe working what should be the current carried by a cable connected to it?
The lamps in a household 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 others also fail
Why is a series arrangement not used for connecting domestic electrical appliances in a circuit?
Which of the following describes the common domestic power supplied in India?
110 V, 100 Hz
100 V, 50 Hz
220 V, 50 Hz
220 V, 100 Hz
- series circuits
- domestic circuits
- parallel circuits
- open circuits
Are the light in your house wired in series?
The earth wire is connected to the metal case of electric appliances.
- True
- False
Explain briefly the function of following in household wiring-
Main switch
What name is given to the device which automatically cuts off the electricity supply during short-circuiting in household wiring ?
How does a DC commutator work?
What is the overloading of an electric circuit? State two conditions that can lead to overloading for a circuit. How can that be prevented?
Which of the following properties of an alternating current is correct?
All of these.
Its frequency is 50Hz for households in India.
It reverses its direction periodically.
An AC can be transmitted over long distances.
What is short circuiting? What is overloading? How can you avoid overloading? [3 MARKS]
An electric oven rated at 500w is connected to a 220v line and used for 2 hours daily. Calculate the cost of electric energy per month at the rate of Rs.5 per KWh
An electric press is rated 750 W , 230 V .Calculate the electrical energy consumed by the press in 16 hours.
SMPS stands for ________.
An MCB which cuts off the electricity supply in case of short-circuiting or overloading works on the :
(a) chemical effect of current
(b) heating effect of current
(c) magnetic effect of current
(d) electroplating effect of current
Why should an electrician use rubber gloves while repairing an electric switch at your home? Explain.
Fuse wire is connected in series with:
Live wire
Neutral wire
Both A & B
None of these
The emf that appears in a Faradays law is:
Around a conducting circuit
around the boundary of the surface used to compute the magnetic flux
through the surface used to compute the magnetic flux
perpendicular to the surface used to compute the magnetic flux
An electric bulb is marked 220V-100W. The bulb is connected to a 220V supply. Calculate
a) the resistance of the filament.
b) current flowing through the filament.
484 Ω and 0.50 A
968 Ω and 0.45 A
484 Ω and 0.45 A
100 Ω and 0.20 A
200 Ω and 0.10 A
