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Chapter 6

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Chapter 6

Ohm’s Law, Work, Energy and Power

V = ? V

I = 4 Amps

R = 4 Ohms

16 V

V = ? V

I = 2 Amps

R = 4 Ohms

8 V

V = ? V

I = .2 Amps

R = 5 Ohms

1 V

V = ? V

I = 4 mA

R = 4 mOhms

16 uV

V = ? V

I = 14 Amps

R = .5 Ohms

7 V

I = 5 uA

R = 4 MOhms

V = ? V

20V

V = ? V

I = 3 mA

R = 2 kΩ

6V

V = ? V

I = 5 nA

R = 1.5 GΩ

7.5V

V = ? V

I = 5 A

R = 1.5 Ω

7.5V

V = 6 V

I = 3 A

R = ? Ω

2 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

Using your Calculator

V = 6 V

I = ? A

R = 3 Ω

2 Amps

Using your Calculator

V = 6 V

I = ? mA

R = 3 Ω

2000 mA

Using your Calculator

V = 10 mV

I = 2 mA

R = ? mΩ

5000 mOhms

Using your Calculator

V = 10 mV

I = 2 mA

R = ? Ω

5 Ohms

Using your Calculator

V = 10 mV

I = 2 mA

R = ? MΩ

.000005 MOhms

Using your Calculator

V = 10 x 10-4V

I = 2 mA

R = ? MΩ

.0000005 MOhm

5 x 10^-7 MOhm

Using your Calculator

V = 10 x 10-4V

I = 2 x 10-3A

R = ? MΩ

.0000005 MOhm

5 x 10^-7 MOhm

Work

What is work?

Motion must take place for work to take place

Work takes place when electrical energy is converted to mechanical energy and vice versa

What is the unit for work?

Joule (J)

(This is also the same unit for Energy)

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?

Power is how much work can be done in a specific amount of time

(Like MPH)

Units for Power is Watts (W)

(Like MPH)

W = Q * V

Power

Equation for Power

Power = Work / Time

(Like MPH)

Power = Voltage * Current

P = V * I

Power

See how Power also equals:

P = V2/R

P = I2 * R

P = V * I

P = V2/R

Power

P = I2 * R

P = ? Watts

I = 6 Amps

V = 3 Volts

P = 18 Watts

P = V * I

P = V2/R

Power

P = I2 * R

P = 18 Watts

I = 6 Amps

V = 3 Volts

R = ? Ω

R = .5 Ohms

P = V * I

P = V2/R

Power

P = I2 * R

P = ? Watts

I = 5 Amps

V = 50 Volts

V = ? Volts

R = 10 Ohms

P = 250 Watts

P = V * I

P = V2/R

Power

P = I2 * R

P = ? Watts

V = 3 Volts

R = 9 Ω

P = 1 Watts

P = V * I

P = V2/R

Power

P = I2 * R

P = 32 Watts

R = 2 Ω

I = ? A

I = 4 Amps