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Phys A Levels > DC Circuits > Flashcards

DC Circuits Flashcards

1
Q

Look at page 2 for all the symbols ye mate gl

A

okay

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2
Q

Current in a series circuit?

A

Stays the same

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3
Q

What affects current in series circuit?

A

Voltage and number of components

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4
Q

Summary of current in a series circuit?

A
  • Stays the same
  • +V = increases
  • +Components = decreases
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5
Q

Summary of current in a parallel circuit?
(3 things)

A
  • Current splits at a junction
  • Largest currents will flow to path w/ least resistance
  • Sum of current after split (junction) is equal to current before
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6
Q

What is Kirchoff’s first law?

A

At a junction in a circuit, the sum of the currents entering the junction is equal to the sum of the currents leaving the junction

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7
Q

Define Electro motive force (EMF)

A

The energy converted to electrical energy per unit of charge

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8
Q

Define Potential difference (PD)

A

Measure of energy, per unit of charge, transferred between 2 points in a circuit

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9
Q

Work done = ? x ?
Equation type shit

A

J = V x C

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10
Q

Voltage in a series?

A

It is split between each component

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11
Q

Summary of voltage in series?

A
  • P.D splits between components
  • Larger resistance = more P.D (ohms law)
  • Sum of P.D in series = EMF of the supply
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12
Q

Voltage in a parallel?

A

Voltage stays the same

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13
Q

Summary of voltage in parallel?

A
  • P.D is the same for components in parallel loops

why add more cards?

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14
Q

What is Kirchoff’s 2nd law?

A

In any closed loop in a circuit, the sum of the emf’s is equal to the sum of the pd’s around the loop

(basically look at the loops of the circuit and don’t mix other components into it so that u can figure out the voltage of each component within the loop)

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15
Q

Although it’s not at the end of the flashcard, this particular booklet, u gotta look at the questions

A

Sigh

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16
Q

How to find total resistance in a series?

A

U just add them….
Also it may have some different prefixes (aka them fuckin Kilo, Mega type shi), so ig learn them?

17
Q

How to find total resistance in parallel?

Actually, how do u find total resistance in parallel when resistance at top is 100 ohms and resistance and bottom is 500 ohms?

A

How do I explain this….

1/Rtotal = 1/100 + 1/500 = 5/500 + 1/500 = 6/500

Rtotal = 500/6 = 83.3 Ohms

Hopefully thats solid?

18
Q

How to find total resistance if it’s got parallel and series together?

A

First u workout the parallels, then u just add them together

(hopefully that’s understandable)

19
Q

What’s the first way of working out the voltage across each resistor?

A

Work out total current flowing through circuit:

I = V/R <– (the total resistance btw)

Work out voltage across each individual resistor:

I x R = V (individual resistor)

20
Q

What’s the second way of working out the voltage across each resistor?

A

Potential divider equation:

V out = (R2/R1 + R2) x V in (hopefully that’s understandable)

  • V in = Like the total voltage in the circuit, the damn battery
  • The R’s = the specific resistors
  • The top resistor in the fraction can be changed to gain the specific voltage for each resistor
21
Q

What does a thermistor do?

A

Changes resistance with changes in temp

22
Q

W/ thermistor, what happens if there’s low temp in circuit?

A
  • EMF is unchanged
  • Rtotal increases
  • I decreases as total resistance increases
  • V increases as Rtotal/Rtotal+R increases
    ^^ umm is that for each component?
23
Q

W/ thermistor, what happens if there’s high temp in circuit?

A
  • EMF is unchanged
  • Rtotal decreases
  • I increases as total resistance decreases
  • V decreases as Rtotal/Rtotal+R decreases
    ^^ once again, that for components?
24
Q

Purpose of LDR? (Light Dependent Resistor)

A

When light intensity ^, resistance of LDR decreases

25
Q

W/ LDR, what if it’s night?

A

No light present = resistance increases

26
Q

W/ LDR, what if it’s day?

A

Light present = resistance decreases

27
Q

What type of things uses thermistor?

A

Heat control alarm, oven, iron, thermostat in home, fridge

28
Q

What type of things uses LDR?

A

Street lights, security lights

29
Q

What is the EMF of a cell?

A

The quantity of energy each coulomb of charge can receive from the cell. Chemical to electrical energy

Chemical energy converted to electrical energy per unit of charge??? B|

30
Q

What is the PD of a cell?

A

Quantity of energy that each coulomb of charge transfers in the circuit. Electrical to other forms of energy

31
Q

Welp, i think u might have to use this booklet, and then gain some questions to answer ,’:D

A

Oh boy.

Phys A Levels (12 decks)

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