Circuits Flashcards

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1
Q

What is Ohm’s Law?

A

V=IR

Where V is voltage, I is current, and R is resistance

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2
Q

What happens to voltage as current passes through resistors?

A

There is a decrease in total voltage as current passes through resistors.

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3
Q

Resistors in series

A

RT=R1+R2+R3…

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4
Q

Resistors in parallel

A

1/RT=1/R1+1/R2+1/R3…

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5
Q

Resistivity

A

Measures how strong a resistor is

R=pL/A where p is resistivity in n*m, l is length, and A is area

Smaller area-greater resistance
Greater length-greater resistance

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6
Q

Capacitance

A

Store of electrical potential energy

C=Q/V where C is capacitance, Q is charge, and V is voltage

C is also dependent on area. C=£ A/d

Where £ is a constant, A=area, and d=distance

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7
Q

How do we find the electrical potential energy of a capacitor

A

Ec=1/2CV^2
Ec=1/2QV

Where V is the voltage across the capacitor not the voltage of the battery

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8
Q

Capacitors in series

A

Voltage of capacitors in series have to add up to the voltage of the battery

1/Ct=1/C1+1/C2+1/C3…

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9
Q

Capacitors in parallel

A

Each Capacitor in parallel experiences the same voltage as the battery. However, charges are split up between them. A more powerful Capacitor receives more charge.

Ct=C1+C2+C3…

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10
Q

How do dielectrics increase capacitance?

A

Dielectrics are non conducting materials denoted by constant (k) where k is always >1

They increase capacitance by either increasing the charge or lowering the voltage. Remember C=Q/V

Increase in C= (k)C

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