kirchhoff's laws Flashcards

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1
Q

What is kirchhoffe’s first law

A

Sum of all current entering a junction is = sum of the currents leaving the junction

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2
Q

Is current throughout a SERIES circuit the same

A

yes, the current throughout the series circuit is the SAME.

ie. component A and Component B have the same current if in SERIES.

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3
Q

Is current throughout a PARALLEL circuit the same

A

NO, current is split when it enters the parallel circuit.

The total current in the parallel circuit must equal the current in the series circuit.

so if 1 component in the parallel circuit is = 0.2A , and the current in the series circuit is 0.5A, then it means the other component B in the parallel circuit = 0.3A in order to sum up to 0.5A

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4
Q

What is kirchhoffe´s second law

A

It states that in any complete loop around a circuit, the sum of PD of the cell or psu, must = the sum of all voltages of the components

eg. E = epsilon = pd of the cell

V1 = component a´s pd in series with V2 = component b´s pd

E = V1+V2

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5
Q

according to kirchhoffe´s 2nd law, what is the voltage of a component when it is in parallel with another component, and when it is in series with another component.

A

The voltage between 2 components in parallel is the SAME

The voltage between 2 components in series is shared.

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6
Q

how to work out the current in a circuit, given voltage and resistance of the resistors

A

I = V/ TOTAL RESISTANCE of resistors

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7
Q

Potential dividers equation x2

A

Vin/R total = vout /R2

Vin / r1+r2 = v out /r2

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8
Q

equation for potential difference involving emf and vout

or vin and vout

A

emf - vout = Potential difference

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9
Q

What is the equation for internal resistance and meaning of symbols

A

E - v - ir = 0

E is epsilon = emf

V = the potential difference across terminal

I is the current in series circuit

r is the internal resistance

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10
Q

What is the load resistance

A

resistance in the wire/circuit used to get current when you have PD across terminal

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