Electrical Power Flashcards

1
Q

What is power?

A

Rate at which work is done or energy is transferred

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2
Q

What are the units for power?

A

Joules per second (Js-1) or more commonly WATTS (W)

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3
Q

What is the formula for power??

A

P=IV

P= power
I= current
V= voltage

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4
Q

Kilowatt-hours…..what are they?

A

the unit of measurement for the amount of energy used by a household

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5
Q

What does AC stand for?

A

Alternating Current

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6
Q

What does DC stand for?

A

Direct current

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7
Q

What is the difference between AC and DC

A

DC: movement of electrical charge in ONE DIRECTION
- Inefficient
-has a large energy loss

AC: electric charge oscillates (moves back and forth) to transfer energy
- very efficient
- not much energy loss

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8
Q

What do household electricity usually show?

A

energy used = Power x time
(unit = Kwh (killowatt per hour))

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9
Q

Why is there some energy loss in electrical stuff?

A

Transferring electric charge to make electrical energy can emit unwanted heat or light energy

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10
Q

What is Direct Current (DC)?

A

Movement of electric charge in 1 direction

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11
Q

What is Alternating Current (AC)?

A

Movement of electric charge through periodic oscillation of charge

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12
Q

Is AC or DC more efficient and why?

A

AC is more efficient because it has less energy loss as its charge doesn’t need to travel far

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