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Unformatted text preview: Preview of Period 12: Electric Circuits 12.1 Voltage, Current, and Resistance How are voltage, current, and resistance related? 12.2 Resistance and Voltage of Resistors in Connected in Series How does current flow through a series circuit? 12.3 Resistance and Voltage of Resistors Connected in Parallel How does current flow through a parallel circuit? 12.4 Voltage, Resistance, and Current in Combination Circuits How does current flow through a circuit composed of series and parallel resistors? 121 Voltage, Current and Resistance Voltage= Current x Resistance V = I R V = voltage (in volts) I = current (in amps) R = resistance (in ohms) (Ex. 12.1) What is the resistance of a circuit that requires 5 volts of voltage to push 10 amps of current through a circuit? Solve V = I R for R by dividing both sides of the equation by I: = = I V R ohms 5 . amps 10 volts 5 = 122 Act. 12.1: Voltage and Current 1. Connect the meters to the thin 30 cm wire. 2. Set the multimeter to “ A ” to measure DC current. 3. Set the voltmeter switch to “ DC ” Read the voltage from the 0 – 15 V scale. 4. Adjust the DC voltage adjust knob on the power source to provide the correct voltage for each measurement. (For accuracy, use the voltage reading on the voltmeter.) DC Voltage adjust knob DC AC 15 V COM A 123 on/off Multimeter Voltmeter Graph of Voltage vs. Current To find the slope of the graph: 1) Pick any two points on the line. 2) Slope = vertical distance between the points horizontal distance between the points What is the physical meaning of the slope?...
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 Spring '10
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 Current, Resistance, Energy, Resistor, Electrical resistance, Series and parallel circuits

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