HARD
Earn 100

Explain the working and mechanism of a CFL lamp.

Important Questions on Current Electricity

EASY
Physical Science>Physics>Current Electricity>Electrical Power

Write the SI unit of electric power.

MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power

What is meant by electrical power? The rating of a bulb is written as 220 V-100 W. What is its meaning?

MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power

An LED consumes _____ electricity.

(Choose from the following: less/more)

EASY
Physical Science>Physics>Current Electricity>Electrical Power
Which device produces light by the flow of even small amount of current?
MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power

An _____can be used for detecting weak currents in a circuit.

MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power
What is LED?
EASY
Physical Science>Physics>Current Electricity>Electrical Power
Why does a fluorescent tube not generate heat?
MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power
The positive terminal of a battery is always connected to the _____ end of an LED.
EASY
Physical Science>Physics>Current Electricity>Electrical Power
Why a fluorescent tube does not generate heat?
MEDIUM
Physical Science>Physics>Current Electricity>Electrical Power
What are CFLs? Write their advantages.
EASY
Physical Science>Physics>Current Electricity>Electrical Power
List some uses of LED.
EASY
Physical Science>Physics>Current Electricity>Electrical Power
Why does a fluorescent tube not generate heat?
EASY
Physical Science>Physics>Current Electricity>Electrical Power
What makes LEDs more useful for testing the flow of electric current?
EASY
Physical Science>Physics>Current Electricity>Electrical Power
Why are CFL’s preferred over electric bulbs?
EASY
Physical Science>Physics>Current Electricity>Electrical Power
Why are compact fluorescent lamps (CFLs) preferred over electric bulbs?
EASY
Physical Science>Physics>Current Electricity>Electrical Power
What is an LED? Why it is better to use an LED than a torch bulb in electric circuits?
EASY
Physical Science>Physics>Current Electricity>Electrical Power
LED glows even when a _____ (strong/ weak) electric current passes through it. 
EASY
Physical Science>Physics>Current Electricity>Electrical Power

We must save electricity. Write 'Yes' or 'No' for the following questions to see if you are saving electricity.
Will you use LED instead of bulbs wherever possible?

HARD
Physical Science>Physics>Current Electricity>Electrical Power
Why are Compact Fluorescent Lamps (CFLs) preferred over electric bulbs? 
EASY
Physical Science>Physics>Current Electricity>Electrical Power
What are LEDs? List a few of their uses.