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SP2 > C7 > Flashcards

C7 Flashcards

1
Q

Energy is

A

Ability to do work

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2
Q

Forms of energy

A

Light, electrical, heat, potential, nuclear, sound, kinetic, chemical

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3
Q

Earth receives what from the Sun

A

Heat and light energy

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4
Q

Sources of energy

A

Sun, waves, water, wind, biomass, radioactive substances, geothermal, fossil fuel

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5
Q

Electrostatics

A

Electric charges that are stationary

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6
Q

What will happen when two different insulating materials such as glass and silk are rubbed against one another

A

When seperated, friction between the two objects will cause one of the objects to become positively charged while the other, negatively charged

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7
Q

Electroscope

A

Detect the existance of electric charges

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8
Q

Occurrence of lightning

A

When negative charges in the bottom of the cloud are attracted to the positive charges in the ground

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9
Q

How to reduce the electrostatic charges at the body of the tanker

A

Metal chain. Electrostatic chargers will flow from the body of the tanker to the ground through the metal chain, without producing any sparks

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10
Q

Electric current (I)

A

Rate of flow of electrons

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11
Q

Unit for electric current

A

Amphere(a)

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12
Q

Electric current is measured using

A

Ammeter

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13
Q

Voltage (v)

A

Energy needed to move electrons between to points

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14
Q

Unit for voltage (v)

A

Volt (V)

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15
Q

Voltage is measured using

A

Voltmeter

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16
Q

Resistance

A

The ability to resist electric current

17
Q

Unit for resistance

A

Ohm

18
Q

Electric current is made up of

A

Source of electrical energy, electrical components, connecting wire

19
Q

Electrical components

A

Switch, dry cell, bulb, resistor, voltmeter, ammeter, galvanometer

20
Q

Types of electric circuit

A

Series, parallel

21
Q

SCA

A

Itotal = I1=I2

22
Q

PCA

A

Itotal=I1+I2

23
Q

SCV

A

Vtotal=V1+V2

24
Q

PCV

A

Vtotal=V1=V2

25
Q

SCR

A

Rtotal=R1+R2

26
Q

PCR

A

1/Rtotal=1/R1+1/R2

27
Q

Pros of series circuit

A

Same amount of electric charge, all electrical components are controlled by the same switch

28
Q

Cons of series circuit

A

One bad, all bad.,

29
Q

Pros of parallel circuit

A

All can be controlled separately, one bad will still be ok

30
Q

For a room, which circuit is better. Why.

A

Parallel, can be controlled separately. One bad, all still ok

31
Q

Electric magnet

A

Electric conductor

32
Q

Electricmagnet eg

A

straight wire, a coiled wire or a solenoid

33
Q

Electromagnet becomes a

A

temporary magnet when an electric current flows through the electric conductor

34
Q

Strength of the magnetic field of an electromagnet

A

Amount of the electric current that flows

35
Q

Advantage of an electromagnet

A

strength of its magnetic field can change according to the amount of the electric current that flows through the electromagnet.

SP2 (2 decks)

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