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Physics > DC circuits > Flashcards

DC circuits Flashcards

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1
Q

What is the definition of electromotive force? (emf)

A

The amount of electrical energy per unit charge produced inside a source of electrical energy

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2
Q

In parallel, what is true about the potential difference?

A

Pd across components is the same

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3
Q

What is the equation for the rate of heat transfer?

A

VI

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4
Q

What is the equation for the pd across each resistor in series with the cell

A

Current x the resistance of each resistor

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5
Q

What is true about current in parallel?

A

Current adds up

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6
Q

What is true about pd in series?

A

Adds up

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7
Q

What is the equation for total resistance in parallel

A

1/Rt= 1/R1 + 1/R2 + 1/R3

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8
Q

What is the definition of internal resistance

A

The loss of potential difference per unit current in the source when current passes through the source

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9
Q

What is the equation for emf?

A

E=I(R+r)

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10
Q

What is the equation for the current through each resistor

A

Pd across the parallel combination / resistors resistance

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11
Q

What is Kirchhoff’s law about current

A

The total current entering the junction is equal to the total current leaving the junction

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12
Q

What is the equation for cell current?

A

Cell emf/ total circuit resistance

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13
Q

What is Kirchhoff’s law about emf?

A

Sum of the emf is equal to the sun of the pd

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14
Q

What is the equation for ratios between each resistor and pd across each resistor?

A

V1/V2=R1/R2

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15
Q

What does a sensor circuit produce?

A

Produces an output pd which changes as a result of a change of a physical variable such as temperature

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16
Q

What does a light sensor consist of?

A

LDR and variable resistor

17
Q

What is the definition of a potential divider

A

Two or more resistors in series connected to a source of pd

18
Q

What is true about the ratios of the pd’s across resistors

A

Equal to the resistance ratio of the two resistors

19
Q

What does a temperature sensor consist of?

A

Potential divider
Thermistor
Variable resistor

20
Q

What is the fraction for the total resistance across a thermistor

A

V1= R1/R1+R2 x Vin

21
Q

In series what is true about current

A

The current entering a component is the same as the current leaving the component

22
Q

In series what is the equation for total resistance?

A

R= R1+R2+R3

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