Post on 02-Jan-2016
Chapter 6Chapter 6
Ohm’s Law, Work, Energy and Ohm’s Law, Work, Energy and PowerPower
16 V
8 V
1 V
16 uV
7 V
20V
V = ? V
I = 3 mA
R = 2 kΩ6V
V = ? V
I = 5 nA
R = 1.5 GΩ7.5V
V = ? V
I = 5 A
R = 1.5 Ω7.5V
V = 6 V
I = 3 A
R = ? Ω2 Ohms
V = 6 V
I = 3 A
R = ? KΩ.002 Kohms
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Now Use your Calculator
See page 91 in book
Do Example 6.2
V = 6 V
I = ? A
R = 3 Ω
Using your Calculator
2 Amps
V = 6 V
I = ? mA
R = 3 Ω
Using your Calculator
2000 mA
V = 10 mV
I = 2 mA
R = ? mΩ
Using your Calculator
5000 mOhms
V = 10 mV
I = 2 mA
R = ? Ω
Using your Calculator
5 Ohms
V = 10 mV
I = 2 mA
R = ? MΩ
Using your Calculator
.000005 MOhms
V = 10 x 10-4V
I = 2 mA
R = ? MΩ
Using your Calculator
.0000005 MOhm
5 x 10^-7 MOhm
V = 10 x 10-4V
I = 2 x 10-3A
R = ? MΩ
Using your Calculator
.0000005 MOhm
5 x 10^-7 MOhm
WorkWhat is work?
Motion must take place for work to take place
What is the unit for work?
Joule (J)(This is also the same unit for Energy)
Work takes place when electrical energy is converted to mechanical energy and vice versa
What about electrical work? (no motion involved?)
1 Joule = Energy required to raise 1 Coulomb of charge through a potential difference of 1 Volt
Work
What is the equation for work?
W = Q * V
Work = Charge * Voltage
Joules = Coulombs * Volts
Power
What is Power?
W = Q * V
Power is how much work can be done in a specific amount of time
(Like MPH)
Units for Power is Watts (W)
(Like MPH)
Power
Equation for Power
Power = Voltage * Current
(Like MPH)Power = Work / Time
P = V * I
Power
See how Power also equals:
P = V2/R
P = I2 * R
Power
P = ? Watts
I = 6 Amps
V = 3 Volts
P = V2/RP = I2 * R
P = V * I
P = 18 Watts
Power
P = 18 Watts
I = 6 Amps
V = 3 Volts
P = V2/RP = I2 * R
P = V * I
R = ? Ω R = .5 Ohms
Power
P = ? Watts
I = 5 Amps
V = ? Volts
P = V2/RP = I2 * R
P = V * I
R = 10 Ohms P = 250 Watts
V = 50 Volts
Power
P = ? Watts
V = 3 Volts
P = V2/RP = I2 * R
P = V * I
R = 9 Ω
P = 1 Watts
Power
P = 32 Watts
P = V2/RP = I2 * R
P = V * I
R = 2 ΩI = ? A
I = 4 Amps