Lesson 1 - Voltage, Current, Resistance, Ohm's Law, Work

electric charge

property of fundamental particles that determines how they react to electric and magnetic fields

electric charge unit

Cuolombs (C)

voltage

• the amount of work required to move an electric charge from some reference point to another point in space

• work / charge

current

• rate at which electrical charges move through an area

• charge / time

resistance

• opposition to flow of current

• (resistivity x length) / area

what determines how much resistance a wire has?

• material of wire

• length of wire

• cross-sectional area

what type of wire has most resistance?

long, thick, small cross-sectional area wires

5 color bands

• band 1: first digit

• band 2: second digit

• band 3: third digit

• band 4: multiplier (number of zeros after third digit)

• band 5: tolerance

Ohm’s Law

V=IR

Battery life

Battery Life = Capacity / Discharge rate

What is power?

energy / time