What is Ohm's Law? What is Ohm's Law? Voltage Resistance Current The current in a circuit is directly proportional to the electric potential difference impressed across its ends and inversely proportional to the total resistance offered by the external circuit. What is Ohm's Law? Ohm's Law Ohm's Law Equation I = V

R R = V

I Energy required to move a charge from one point to another.

has units of Volts (V) and is measured using voltmeters.

electric potential difference the hindrance to

the flow of charge

measured in ohms the rate at which charge

flows past a point

on a circuit. V = I • R Circuit Connection Series Circuit Parallel Circuit Only one path

for the current

to take is simply a closed

loop through

which charges

can continuously

move More then one

path way for

current

to flow. Relationship on Ohm's Law Current Voltage Resistance Series Circuit Parallel Circuit Itot = I1=

I2=I3.. Itotal = I1

+ I2 + I3 Vbatt= V1 +

V2 + V3 Vbatt=V1

= V2 =V3 = .. Rtot = R1 +

R2 + R3 1/Req = 1/R1 +

1/R2 + 1/R3 Series Circuit Parallel Circuit Comparison Current Resistance More resistor

current decreases

resistance

increases. Increase in resistor

current increases, decreases in resistance The current in a circuit is

directly proportional to the

electric potential difference

and inversely proportional

to the total resistance

offered by the

external circuit.

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