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Physics Unit 3 > Conservation of Energy > Flashcards

Conservation of Energy Flashcards

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1
Q

What is meant by the law of the Conservation of Energy?

A

Energy cannot be created or destroyed, but can be changed from one form into another.

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2
Q

What is the equation for work done?

A

Work done = Force x Distance

W = Fd

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3
Q

An object raised up to a high position is said to have …

A

Gravitational potential energy

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4
Q

What is the equation for potential energy?

A

Potential energy = mass x gravitational field strength x height

Ep = mgh

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5
Q

What is the gravitational field strength?

A

9.8 N/Kg

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6
Q

What energy does a moving object have ?

A

Kinetic energy

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7
Q

What is the equation for kinetic energy?

A

Kinetic energy = a half x mass x velocity squared

Ek = 0.5 x mv(^2)

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8
Q

Potential energy @ TOP = Kinetic energy @ BOTTOM

A

Just remember this lol x

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9
Q

Power efficiency equation

A

Power efficiency (%) = (Power Out / Power In) x 100

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10
Q

Energy efficiency equation

A

Energy efficiency (%) = (energy out/ energy in) x 100

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11
Q

What is energy measured in?

A

Joules (J)

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12
Q

Power is the measure of …

A

The rate of energy conversion

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13
Q

Power is measured in …

A

Watts

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14
Q

Equation for power

A

Power = Energy / time

P= E/t

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15
Q

What are the two types of electrical charge?

A

Positive and negative

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16
Q

Opposite charges …

Like charges …

A

Opposite barges attract

Like charges repel

17
Q

Materials which allow electricity to flow are …

A

Conductors

18
Q

Materials which do not allow electricity to flow are called …

A

Insulators

19
Q

What is electric current ?

A

Electric current is the measure of the flow of charge around a circuit and depends on the amount of charge passing any point in a circuit every second

20
Q

What is the symbol for electrical charge and what is it measured in?

A

Symbol Q

Measured in Coulombs (C)

21
Q

What symbol is electrical current given and what is it measured in?

A

Symbol I

Measured in Amperes / amps (A)

22
Q

What is the equation for charge?

A

Charge = current x time

Q = It

23
Q

What does a.c and d.c stand for?

A

Alternating current and direct current

24
Q

What is alternating current mostly produced by?

A

Alternating current is produced by most generators and is used in mains electricity

25
Q

What is direct current produced by?

A

Direct current is produced by cells & batteries

26
Q

What is the mains supply voltage and frequency?

A

230 Volts @ 50 Hz

Physics Unit 3 (1 decks)

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