10 Electrical Ciruits Flashcards

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1
Q

Kirchhoff’ s first law

A

Current into a junction = current out

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2
Q

Kichhoff’s second law

A

In an circuit the sum of the electromotive force is equal to the sum of the potential differences around a closed loop

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3
Q

Kirchhoff’s laws in series

A

The current is the same in every component
Potential difference is shared proportionally between components based on resistance big R -> big V

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4
Q

Kirchhoff’s laws in parallel

A

Current is shared proportionally between components based on resistance big R -> small I
EMF is equal to the potential difference in each component

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5
Q

Rt in series

A

R1 + R2+ …

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6
Q

Vt in series

A

V1 + V2 + …

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7
Q

Rt in parallel

A

1/Rt = 1/R1 + 1/R2 + …

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8
Q

It in parallel

A

I1 + I2 + …

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9
Q

What are the four important equations for analysing circuits

A

Q = It
W = VQ
P = IV
V = IR

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10
Q

Lost volts = Epsilon - V

A

Lost volts = EMF - terminal pd

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11
Q

How does current effect lost volts

A

As current increases lost volts increases as current decreases lost volts decreases

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12
Q

Lost volts = Ir

A

Lost volts = current x internal resistance

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13
Q

Epsilon = I(R + r)

A

EMF = current ( resistance + internal resistance)

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14
Q

How can varying potential difference be achieved

A

Using a potential divider and a variable resistor

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15
Q

Potentiometer

A

A variable resistor with three terminals and a sliding contact. Used in low voltage electrical circuits

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