April 11, 2008 Get out last night’s homework.

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Presentation transcript:

April 11, 2008 Get out last night’s homework. REVIEW April 11, 2008 Get out last night’s homework. Find a reliable partner and go over your work together.

No Units = Incorrect Answer REVIEW 1. How much current is there in a 50-ohm lamp bulb connected to a 120-volt wall outlet? Sketch a schematic. List given information R = 50 ohms V = 120 volts I = ? Sketch schematic Write formula and solve V = I x R I = V / R I = 120 / 50 I = 2.4 amps No Units = Incorrect Answer R = 50 ohms 120V I = ?

List given information REVIEW 2. A spot welder produces 150 amperes through a resistance of 0.01 ohms. Sketch a schematic and find the voltage. List given information I = 150 amps R = 0.01 ohms V = ? Sketch schematic Write formula and solve V = I x R V = 150 x 0.01 V = 1.5 volts + R = 0.01 ohms V = ? - I = 150 A

List given information REVIEW 3. What is the power available in a house circuit if a 120-volt circuit allows a maximum of 20 amperes? List given information V = 120 volts I = 20 amps P = ? Write formula and solve P = V x I P = 120 x 20 P = 2400 W How many kilowatts is this? 2400 / 1000 = 2.4 kW

REVIEW 4. Using Ohm’s Law and Joule’s Law, write an equation for power that does not include voltage.

Solve either Joule’s or Ohm’s Law for I REVIEW 5. Using Ohm’s Law and Joule’s Law, write an equation for power that does not include current. Joule’s Law P = V x I Ohm’s Law V = I x R Solve either Joule’s or Ohm’s Law for I V = I x R - Ohm’s Law I = V / R - Solve for I Substitute into other formula: P = V x I - Joule’s Law P = V x (V / R) P = V2 x R

List given information REVIEW 6. 3 resistors are in series: 20 ohms, 30 ohms, 40 ohms. What is the total resistance? Sketch a schematic. List given information R1 = 20 ohms R2 = 30 ohms R3 = 40 ohms Sketch schematic Write formula and solve R1 R2 R3 R = R1 + R2 + R3 T R = 20 + 30 + 40 T R = 90 ohms T

List given information REVIEW 7. 4 resistors are in parallel: 20 ohms, 30 ohms, 40 ohms. What is the total resistance? Sketch a schematic. List given information R1 = 20 ohms R2 = 30 ohms R3 = 40 ohms Sketch schematic Write formula and solve R1 R2 R3

REVIEW

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Study for Monday’s Test! REVIEW CLASSWORK/HOMEWORK Study for Monday’s Test!