Physics KBSM Form 5: 2.5 Electric power & energy

What is the energy possessed by a charge due to its position in an electric field?

• electrical potential energy

• electrical kinetic energy

• electrical mechanical energy

• electrical potential difference

Tags

NGSS.HS-PS3-2

Electric energy is the energy carried by electric charges to _____________ in a complete circuit having potential difference, V.

• flow current

• do work

• move between two points

• change form

Electric power is....

• rate of electrical energy transform to another type of energy.

• ability to do work in electric circuit

• rate of flow of charges in electric circuit

• ability to change the form of electrical energy to another type of energy

kilowatt hour is equal to

• 1000 W for 3600 s

• 10000 W for 1 hour

• 1 kg for 1 hour

• 500 W for 3600 s

1 unit is equal to one kilowatt-hour [kWh], also equal to ____________ [joules].

• 3,600 J

• 360,000 J

• 3,600,000 J

• 360,000,000 J

Efficiency is...

• The percentage of energy that is actually used to do work

• The ability of electrical appliances to keeps energy in

Keep refrigerator doors open in long time, high power bulbs at car porch, disable timer on air-conditioning, ironing clothes in small quantities. These actions will cause...

• low energy efficiency

• low electrical energy consumption

• high energy efficiency

• lower monthly electric bill

Which of the following energy transformations occur when you switch on a ceiling fan?

• Kinetic to light

• Electrical to kinetic

• Electrical to light

• Kinetic to electrical

In energy transformations, "wasted energy" usually takes what form?

• heat
• chemical energy
• light
• sound waves

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

A lamp changes __________ energy into light and heat energy.

• Kinetic

• Electrical

• Sound

• Chemical