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physics > electricity- yr9 core questions > Flashcards

electricity- yr9 core questions Flashcards

1
Q

Why are metals such good conductors?

A

They have delocalised electrons

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2
Q

What is the equation for charge in terms of current?

A

Q = It

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3
Q

What is one amp?

A

One coulomb per second

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4
Q

What is voltage?

A

Energy per unit charge

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5
Q

What is the equation for voltage/potential difference in terms of energy?

A

V = E/Q

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6
Q

What is one volt?

A

One joule per coulomb

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7
Q

What is the rule for voltage/potential difference in series circuits?

A

Voltage is shared across components

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8
Q

What is the rule for voltage/potential difference in parallel branches in a circuit?

A

The voltage across parallel branches of a circuit is the same

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9
Q

What can we say about components in parallel?

A

They are at the same voltage

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10
Q

What is Ohm’s law?

A

Current is directly proportional to voltage

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11
Q

What is the Ohms law formula?

A

V = IR

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12
Q

In a series circuit, how is the voltage/potential difference of a component related to its resistance?

A

The voltage is proportional to the resistance

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13
Q

What is an ohmic conductor?

A

One where current is directly proportional to voltage (obeys Ohm’s law)

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14
Q

How does current affect temperature?

A

The greater current the greater the temperature

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15
Q

How does temperature affect resistance?

A

The greater temperature the greater the resistance

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16
Q

How does wire thickness affect resistance?

A

The thicker the wire the lower the resistance

17
Q

What is a resistor?

A

A component that resists the flow of charge

18
Q

What is the total resistance of resistors in series?

A

Sum of the resistance of all resistors

19
Q

Do the same resistors in parallel have greater or less resistance than in series?

A

Less

20
Q

When resistances are in parallel, what can we say about their total resistance?

A

The total resistance is less than the smallest resistance

21
Q

What does a variable resistor do?

A

Changes its resistance with manual adjustment

22
Q

What does a thermistor do?

A

Changes its resistance with manual adjustment

23
Q

What does a thermistor do?

A

Lowers its resistance with raised temp

24
Q

What is an LDR?

A

Light dependant resistor

25
Q

What does an LDR do?

A

Reduces in resistance with brighter light

26
Q

What does a diode do?

A

Only allows current to flow in one direction

27
Q

What is an LED?

A

Light emitting diode

physics (5 decks)

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