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WorksheetsElectrical Efficiency Aqmar sigma
Total questions: 40
Worksheet time: 21mins
What is the main purpose of an efficient electrical device?
To use more energy
To waste energy
To save energy
To make noise
Which of the following is an example of wasted energy in a light bulb?
Light
Sound
Heat
Electricity
The term “energy efficiency” means...
Using energy quickly
Producing more waste energy
Maximizing useful output
Using high voltage
What energy transformation occurs in an electric fan?
Electrical → Light
Electrical → Kinetic
Electrical → Sound only
Kinetic → Electrical
Which energy form is often considered wasted in machines?
Kinetic
Chemical
Light
Heat
Why is heat from an electric motor considered waste?
It helps cool the room
It does not contribute to the main function
It is useful energy
It increases efficiency
Which device is usually more energy efficient?
Incandescent bulb
Electric kettle
Hair dryer
Fan heater
Which one is more efficient: LED or filament bulb?
Filament bulb
LED
Both are equal
Neither is efficient
A device that converts most of its input energy into useful energy is called...
Inefficient
Useless
Efficient
Complex
What is one advantage of using energy-efficient devices?
Use more electricity
Reduce electricity bills
Increase heat
Decrease brightness
Which of these is not a form of energy loss?
Heat
Sound
Useful light
Vibration
What does a high-efficiency rating mean?
More energy is wasted
More useful output
Device is slower
Less power used
Which home appliance should be energy efficient to save most electricity?
Toaster
Washing machine
Blender
Electric toothbrush
Energy labels on appliances help us to...
Choose expensive products
Know the colour
Compare efficiency
Know voltage only
What color is usually used to show best energy efficiency rating?
Red
Yellow
Green
Blue
Which action increases the efficiency of a fan?
Covering it
Cleaning the blades
Blocking air flow
Using old wiring
Why should we reduce energy waste?
To damage environment
To increase noise
To save energy and money
To overheat devices
The “useful energy” output of a television is mostly...
Heat
Light and sound
Movement
Chemical energy
In terms of energy, what makes a machine inefficient?
Producing more useful output
Wasting more input energy
Having beautiful design
Working faster
Which factor improves energy efficiency?
Poor maintenance
Low-quality materials
Regular servicing
Overloading
If a bulb converts 80% of energy into light, it is...
Inefficient
80% efficient
Using 80W
A heater
What is meant by energy conservation?
Using more power
Storing electricity
Reducing unnecessary use
Generating energy
Which of these devices wastes the most energy as heat?
Radio
Blender
Light bulb (filament)
LED lamp
Why do energy-efficient devices help the environment?
They cost more
They reduce carbon emissions
They are louder
They use more heat
Which energy transformation in an electric iron is considered useful?
Electrical → Sound
Electrical → Heat
Heat → Kinetic
Heat → Light
Energy efficiency is important because...
It increases pollution
It reduces energy bills
It increases sound levels
It improves color
Which component helps to reduce energy loss in electrical devices?
Old wires
Insulator
Rusty parts
Dust
Energy-efficient buildings often use...
Many fans
Energy-saving bulbs
Thick glass windows
Old air conditioners
How do solar panels show energy efficiency?
They waste light
They convert sunlight into electricity
They produce noise
They store sound
Why is using LED bulbs encouraged?
They are brighter
They waste more energy
They are decorative
They use less electricity
Which energy output is always considered waste in electrical devices?
Light
Sound
Heat
Movement
Which of the following does not improve energy efficiency?
Servicing
Insulation
Overuse
Proper use
What type of energy is most useful in a speaker?
Sound
Heat
Light
Electrical
Which situation describes energy inefficiency?
A bulb emits only light
A fan generates extra heat
A motor moves smoothly
A fridge keeps food cold
Why do engineers design efficient machines?
To waste energy
To reduce function
To save cost and energy
To make them bigger
What is one consequence of using inefficient appliances?
Low electricity bills
Better lighting
More energy waste
Reduced pollution
Which energy transformation happens in a hairdryer?
Electrical → Light
Electrical → Heat and kinetic
Kinetic → Electrical
Sound → Electrical
Which tool helps monitor electrical efficiency at home?
Thermometer
Energy meter
Stopwatch
Compass
One way to use energy more efficiently is...
Keep devices on all night
Use LED lights
Overcharge phones
Buy bigger appliances
What is an example of improving electrical efficiency at school?
Use broken fans
Install LED lights
Open windows only
Use more heaters
