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