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Satkriti Roao
@satkriti-roao
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Joined: Jun 14, 2021
Last seen: Aug 6, 2021
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Topics: 2248 / Replies: 1
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Topic
What is the difference between a renewable and a non-renewable source of energy? Explain with examples.
5 years ago
Forum
Sources of Energy
Replies: 0
Views: 96
Topic
What is meant by a renewable source of energy? Give two examples of renewable sources of energy.
5 years ago
Forum
Sources of Energy
Replies: 0
Views: 82
Topic
What is meant by a non-renewable source of energy? Give two examples of non-renewable sources of energy.
5 years ago
Forum
Sources of Energy
Replies: 0
Views: 65
Topic
State any four characteristics of a good source of energy.
5 years ago
Forum
Sources of Energy
Replies: 0
Views: 63
Topic
What is a source of energy? What are the two main categories of the sources of energy?
5 years ago
Forum
Sources of Energy
Replies: 0
Views: 71
Topic
The amount of heat produced by burning a unit mass of a fuel completely is known as its ………………… value.
5 years ago
Forum
Sources of Energy
Replies: 0
Views: 69
Topic
“The ignition temperature of a fuel is 80°C”. What does this mean?
5 years ago
Forum
Sources of Energy
Replies: 0
Views: 86
Topic
Define ignition temperature of a fuel.
5 years ago
Forum
Sources of Energy
Replies: 0
Views: 85
Topic
Which of the following produces more heat (per unit mass) on burning? Coal or LPG
5 years ago
Forum
Sources of Energy
Replies: 0
Views: 100
Topic
“The calorific value of cooking gas (LPG) is 50 kJ/g”. What does it mean?
5 years ago
Forum
Sources of Energy
Replies: 0
Views: 98
Topic
Define calorific value of a fuel.
5 years ago
Forum
Sources of Energy
Replies: 0
Views: 81
Topic
Name a non-renewable source of energy other than fossil fuels.
5 years ago
Forum
Sources of Energy
Replies: 0
Views: 89
Topic
A domestic lighting circuit has a fuse of 5 A. If the mains supply is at 230 V, calculate the maximum number of 36 W tube lights that can be safely used in this circuit.
5 years ago
Forum
Magnetic Effects of Electric Current
Replies: 0
Views: 124
Topic
(a) Explain why, it is more dangerous to touch the live wire of a mains supply rather than the neutral wire. (b) Why is it safe for birds to sit on naked power lines fixed atop tall electric poles?
5 years ago
Forum
Magnetic Effects of Electric Current
Replies: 0
Views: 373
Topic
What is the main difference between the wiring of an electric bulb and a socket for using an electric iron in a domestic electric circuit? What is the reason for this difference?
5 years ago
Forum
Magnetic Effects of Electric Current
Replies: 0
Views: 421
Topic
An electric kettle rated as 1200 W at 220 V and a toaster rated at 1000 W at 220 V are both connected in parallel to a source of 220 V.
5 years ago
Forum
Magnetic Effects of Electric Current
Replies: 0
Views: 431
Topic
Which of the following circuits will still be dangerous even if the fuse blows off and electric iron stops working during a short circuit?
5 years ago
Forum
Magnetic Effects of Electric Current
Replies: 0
Views: 99
Topic
A vacuum cleaner draws a current of 2 A from the mains supply. (a) What is the appropriate value of the fuse to be fitted in its circuit?
5 years ago
Forum
Magnetic Effects of Electric Current
Replies: 0
Views: 348
Topic
Three appliances are connected in parallel to the same source which provides a voltage of 220 V. A fuse connected to the source will blow if the current from the source exceeds 10 A.
5 years ago
Forum
Magnetic Effects of Electric Current
Replies: 0
Views: 340
Topic
An air-conditioner of 3.2 kW power rating is connected to a domestic electric circuit having a current rating of 10 A. The voltage of power supply is 220 V. What will happen when this air-conditioner is switched on? Explain your answer.
5 years ago
Forum
Magnetic Effects of Electric Current
Replies: 0
Views: 220
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