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Nat5 Physics > Electricity > Flashcards

Electricity Flashcards

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1
Q

What’s the unit for current?

A

A

Amps

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2
Q

What’s the unit for voltage?

A

V

Volts

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3
Q

What’s the unit for resistance?

A

Ω

Ohms

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4
Q

What’s the unit for power?

A

W

Watts

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5
Q

What’s the unit for charge

A

C

Coulombs

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6
Q

What’s the unit for energy

A

J

Joules

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7
Q

Explain *in terms of electron flow *what is meant by alternating current.

A

The direction that the electrons flow changes continuously back and forth

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8
Q

What equation do you use to work out the total resistance of the resistors arranged like this in a circuit? Use the relationship sheet to check

_____R1_____R2_____

A

Total resistance, RT=R1+R2

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9
Q

What equation do you use to work out the total resistance of the resistors arranged like this in a circuit? Use the relationship sheet to check

|___R1____|
|___R2____|

A

1/RT = 1/R1+ 1/R2

don’t forget to do 1/ [ANS] on calculator at the end to find RT

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10
Q

What is the difference between
DC (direct current)
and
AC (alternating current)?

A

In DC the current always travels in the same direction.

In AC the current constantly switches direction back and forth

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11
Q

If Voltage stays the same but current increases what must happen to resistance?

A

Resistance decreases

because V=IR so if I goes up then R must come down

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12
Q

If 2 resistors of different values are arranged in parallel what is the same for each resistor?

Current through the resistor
or
voltage across the resistor?

A

Voltage across each resistor is the same

current will depend on size of the 2 resistors (bigger R smaller I)

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13
Q

If 2 resistors of different values are arranged in series what is the same for each resistor?

Current through the resistor
or
Voltage across the resistor?

A

Current is the same through each resistor

Voltage will depend on the size of the resistors - bigger R bigger V

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14
Q

What is unique about a diode?

A

It only lets current flow in one direction (the direction of the arrow)

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15
Q

When does an LED light up?

A

When the current is flowing in the direction of the arrow.

An LED doesn’t let current flow in the other direction

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16
Q

If you increase the temperature of a thermistor what happens to the resistance?

Does it go up or down?

A

Resistance goes down

Remember TURD (Temperature Up, Resistance Down)

17
Q

If you increase the light on a light dependent resistor (LDR) what happens to the resistance?

Does it increase or decrease?

A

It decreases

LURD (Light Up,Resistance Down)

18
Q

If you decrease the temperature of a thermistor what happens to the resistance?

Does it increase or decrease?

A

Increases

Remember TURD Temp Up Resistance Down or vice versa

19
Q

If a charged particle is in an electric field what happens to it?

A

It experiences a force

  • A charge will be attracted to a plate of the opposite charge and move towards the plate
  • A charge will be repelled by a plate which is the same charge and will move away from the plate
20
Q

What is meant by potential difference?

A

Potential difference (or voltage) is the measure of the energy given to the charge carriers in the circuit

21
Q

In a lamp what happens to the resistance when the lamp turns on?

A

Resistance increases

It gets hot so the molecules in the lamp move around more

So it’s harder for the electrons to get through - so resistance increases

22
Q

When does a transistor ‘turn on’
(conduct electricity)

A

When the input voltage (from ‘base’ to earth) is bigger than the threshold voltage

  • NPN transistor (0.7 V)
  • MOSFET (2 V)
23
Q

If you add an extra resistor in parallel what happens to the overall resistance?

A

Overall resistance goes down

24
Q

What is the symbol on the formula sheet for current?

A

I

25
Q

What is the symbol on the formula sheet for voltage?

A

V

26
Q

What is the symbol on the formula sheet for resistance?

A

R

27
Q

What is the symbol on the formula sheet for charge?

A

Q

28
Q

What is the symbol on the formula sheet for power?

A

P

29
Q

What is the symbol on the formula sheet for energy?

A

E

Nat5 Physics (7 decks)

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