Advertisements
Advertisements
Question
Name two common material used for heating elements.
Advertisements
Solution
Nichrome and manganin are the common alloys that are mostly used for making heating elements.
Nichrome is: 60% nickel + 25% iron + 15% chromium.
Manganin is: 83% manganese + 13% copper + 4% nickel.
RELATED QUESTIONS
Name the commercial unit of electric energy.
At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulb could be switched on in the house at the same time (if they are all connected in parallel)?
Why is an electric light bulb not filled with air? Explain why argon or nitrogen is filled in an electric bulb.
Electrical power P is given by the expression P = (Q × V) ÷ time. What do the symbols Q and V represent?
What are the two main systems of wiring commonly used in houses? Which of these systems mentioned by you is better and why?
At what voltage is the electric power generated at the generating station? Explain the transmission of this power to your house.
The equation I2R seems to suggest that the rate of heating in a resistor is reduced if resistance decreases, whereas equation P = V2/R suggests just the opposite. How do you reconcile this problem?
Electric power is inversely proportional to ____________.
1 kWh = ______ J.
