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Physics > Circuits > Flashcards

Circuits Flashcards

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1
Q

Filament bulb

A

Turns electrical energy into light energy

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2
Q

Cell

A

Provides energy/power

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3
Q

Battery

A

More than one cell

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4
Q

Motor

A

Turn eletrical energy into kinetic energy

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5
Q

Open switch/Closed switch

A

Break the circuit

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6
Q

Ametre

A

Measures current

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7
Q

Resistor

A

Restricts the flow of current

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8
Q

Voltmeter

A

Measures voltage

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9
Q

LED

A

Transfers eletrical energy into light energy

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10
Q

LDR

A

Resistance changes if subject to light

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11
Q

Variable resistor

A

Can change resistance manually

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12
Q

Capacitor

A

Stores charge

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13
Q

Thermistor

A

Resistance changes with temperature

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14
Q

Fuse

A

Melts if too much current flows through

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15
Q

Diode

A

Only allows current to flow one way

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16
Q

Kirchoffs 1st law

A

The total current into a junction Is always equal to the total current out of a junction

17
Q

Current in a series circuit

A

Always remains the same

18
Q

Current in a parallel circuit

A

Current after the split tables the same as before the split.

19
Q

Electro motive force (EMF)

A

(Energy into a circuit)

the energy given to each charge

20
Q

Potential difference

A

(Energy out of a circuit)

The energy change by each charge

21
Q

Kirchoffs 2nd law

A

The EMF of a circuit is always equal to the total P.D of each path an electron can take in the circuit

22
Q

Total resistance in a series circuit equation

A

Rt=r1+r2+r3

In a series circuit, each electron will here to pass all the resistors

23
Q

Total resistance in a parallel circuit equation

A

1/Rt= 1/r1 + 1/r2 + 1/r3

In a parallel circuit the total resistance is always smaller than the smallest resistance in each loop of the circuit

24
Q

Ohms law

A

The current flowing through a device is directly proportional to the potential difference across that device at a constant temperature

25
Q

Directly proportional

A

If one variable decreases or increases by a factor. The other does the same by the same factor.

26
Q

What is an LDR made Of?

A

semiconductors. Semiconductors are not very good at conducting electricity, unless they’re given energy to release the electrons into their atoms. The light provides better energy to these atoms so the brighter it is, the better a conductor the LDR is, and the lower the resistance

27
Q

Inversely proportional

A

If one increases by a factor the other decreases by the same factor

28
Q

Directly proportional

A

If one increases the other does by the same factor

Physics (9 decks)

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