Physics- Electricity

Volts (V)

What is Voltage measured in?

Amperes/Amps (A)

What is Current measured in?

V=PE/q

Voltage Equation

Joules/Coulombs

Units version of Voltage Equation

q

Quantitiy of Electrons/Charge amount

Voltage Drop

Electrons flow through an electric component, and BOTH potential energy and electric potential energy DECREASE.

PE

Electric Potential Energy (Joules)

I=q/t

Equation for Current

t

time

Coulombs/Seconds

Units version of Current Equation

Causes Of Resistance

1. Core electron Abundance

2. Lack of valence electrons

3. Length of conductor (L)

4. Hotter temperatures= More moving= ?

5. Thinner conductor

Low

High conductivity=_____ resistivity

High

Low conductivity=_____ resistivity

V=IR

Equation for Ohm’s Law

R

Resistance

Ohms (Omega Symbol)

What is Resistance measured in?

P=IV

Power Equation

Watts (W)

What is Power measured in?

P=I²R

Knowing Ohm’s Law, how do you rewrite the equation for Power? (part 1)

P=V²/R

Knowing Ohm’s Law, how do you rewrite the equation for Power? (part 2)

Joules/Seconds=Watts

Units Version of Power Equation

Voltmeter

Volt-measuring object

Ammeter

Amp-measuring object

Ohmmeter

Ohm-measuring object

Multimeter

Volt, Amp, AND Ohm-measuring object

Parallel

To measure VOLTAGE, the multimeter is put in _____ with the circuit.

Series

To measure CURRENT, the multimeter is put in _____ with the circuit.

Left

If current flows right, where do the electrons flow? (Hint: They always travel NEGATIVE to POSITIVE)

Components In Series

1. The Current through each component stays the SAME and takes ONE pathway

2. The Voltage drops through each component, reaching 0 right before the battery.

Req

Equivalent Resistance

Rtotal=R1+R2+R3

Equation for Resistance Total

Vtotal=V1+V2+V3

Equation for Voltage Total

Itotal=I1=I2=I3

Equation for Current Total

Right Outside Battery

Where can total current (Itotal) be measured?

Total Voltage(Vtotal)

Voltage Drops add to _____ in the circuit