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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.

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Chapter 6

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



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


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