1. Electric Current & Electricity Calculations
IPC Notes
Electric Current &
Electricity Calculations

2. Electric Current
electric current – the flow of electrons through a conductor resistance – the tendency of an object to resist the flow of electrons

3. Closed vs. Open Circuits
closed circuit – allows the flow of electricity; the circuit is complete

4. Closed vs. Open Circuits
open circuit – prevents the flow of electricity; the circuit is incomplete

5. Batteries
battery – uses voltage differences to create a flow of current

6. 2 Types of Batteries
dry cell battery – uses a chemical paste surrounding a carbon rod ex) AA battery

7. 2 Types of Batteries
wet cell battery – uses 2 types of metallic plates suspended in a conducting solution ex) car battery

8. Electricity Calculations
V = I x R
V = voltage (volts)
I = current (amps)
R = resistance (Ohms)

9. Electricity Calculations
P = I x V
P = power (watts)
I = current (amps)
V = voltage (volts)

10. Electricity Calculations
E = P x t
E = energy (kilowatt hours)
P = power (kilowatts)
t = time (hours)

11. 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?

12. Practice Problem #2
What is the resistance of an appliance that uses 0.89 amps when the voltage is 120 volts?

13. Practice Problem #3
How much current is flowing through a wire with a 4.5 ohm resistor and a 6 volt battery?

14. Practice Problem #4
How much power is used if 350,000 kilowatt hours of energy are used in 58 hours?

15. Practice Problem #5
What is the voltage of a battery if 4.5 watts are used with 0.5 amps of current?

16. Practice Problem #6
How long does it take a 2 kilowatt appliance to use 36.5 kwh of energy?