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IPC Notes
Electric Current & Electricity Calculations
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Electric Current
electric current – the flow of electrons through a conductor
resistance – the tendency of an object to resist the flow of electrons
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Closed vs. Open Circuits
closed circuit – allows the flow of electricity; the circuit is complete
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Closed vs. Open Circuits
open circuit – prevents the flow of electricity; the circuit is incomplete
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Batteries
battery – uses voltage differences to create a flow of current
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2 Types of Batteries
dry cell battery – uses a chemical paste surrounding a carbon rod
ex) AA battery
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2 Types of Batteries
wet cell battery – uses 2 types of metallic plates suspended in a conducting solution
ex) car battery
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Electricity Calculations
V = I x R
V = voltage (volts)I = current (amps)R = resistance (Ohms)
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Electricity Calculations
P = I x V
P = power (watts)I = current (amps)V = voltage (volts)
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Electricity Calculations
E = P x t
E = energy (kilowatt hours)P = power (kilowatts)t = time (hours)
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Practice Problem #1How much power is used by a light bulb if it uses a current of 1.2 amps and a voltage of 120 volts?
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Practice Problem #2What is the resistance of an appliance that uses 0.89 amps when the voltage is 120 volts?
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Practice Problem #3How much current is flowing through a wire with a 4.5 ohm resistor and a 6 volt battery?
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Practice Problem #4How much power is used if 350,000 kilowatt hours of energy are used in 58 hours?
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Practice Problem #5What is the voltage of a battery if 4.5 watts are used with 0.5 amps of current?
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Practice Problem #6How long does it take a 2 kilowatt appliance to use 36.5 kwh of energy?