Chapter 6 Ohm’s Law, Work, Energy and Power. 16 V.

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Presentation transcript:

Chapter 6 Ohm’s Law, Work, Energy and Power

16 V

8 V

1 V

16 uV

7 V

20V

V = ? V I = 3 mA R = 2 k Ω 6V

V = ? V I = 5 nA R = 1.5 G Ω 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 = ? k Ω.002 kΩ

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Now Use your Calculator See page 92 in book Practice Problem 6.1 The answers to practice problems are at the end of the chapter

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 = ? Ω Using your Calculator 5 Ohms

V = 10 mV I = 2 mA R = ? m Ω Using your Calculator 5000 mOhms

V = 10 mV I = 2 mA R = ? M Ω Using your Calculator MOhms

V = 10 x V I = 2 mA R = ? M Ω Using your Calculator MOhm 5 x 10^-7 MOhm

V = 10 x V I = 2 x A R = ? M Ω Using your Calculator MOhm 5 x 10^-7 MOhm

Work What 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? Power is how much work can be done in a specific amount of time (Like MPH) Units for Power is Watts (W) (Like MPH) P = Work / Time

Power Equation for Power Power = Voltage * Current Power = Work / Time P = V * I Power = Q * V / Time Power = I * Time * V / Time Remember W = Q*V Remember I = Q/t Thus Q = I*t Power = I * V

Power See how Power also equals: P = V 2 /R P = I 2 * R

Power P = ? Watts I = 6 Amps V = 3 Volts P = V 2 /R P = I 2 * R P = V * I P = 18 Watts

Power P = 18 Watts I = 6 Amps V = 3 Volts P = V 2 /R P = I 2 * R P = V * I R = ? Ω R =.5 Ohms

Power P = ? Watts I = 5 Amps V = ? Volts P = V 2 /R P = I 2 * R P = V * I R = 10 Ohms P = 250 Watts V = 50 Volts

Power P = ? Watts V = 3 Volts P = V 2 /R P = I 2 * R P = V * I R = 9 Ω P = 1 Watts

Power P = 32 Watts P = V 2 /R P = I 2 * R P = V * I R = 2 Ω I = ? A I = 4 Amps

Power P = ? P = V 2 /R P = I 2 * R P = V * I I = ? P = 20W I = 2A

Power P = ? P = V 2 /R P = I 2 * R P = V * I R = ? P = 2W R = 50 Ohm

April kWh kWh 553 – 851 kWh 851+ kWh 14¢ 19¢ 27¢ 31¢ Sept kwHr = $ kwHr = $96.46

Oct kwHr = $108