1. Electric Potential Energy & Voltage.

2. Battery Battery : A battery is a combination of electrochemical cells connected together. What does an electrochemical cell do? Electro – Chemical cell – Creates electric energy from chemical energy

3. Battery

5. Electric Potential Energy: Types of energy Energy: the ability to do work equals energy Two types of Energy:

6. Electric Potential Energy: Types of energy Energy: the ability to do work equals energy Two types of Energy:

7. Electric Potential Difference Remember... Charge is measured in coulombs The amount of electric potential energy per coulomb of a charge is called potential energy known as voltage.

8. Electric Potential Difference Remember... Charge is measured in coulombs The amount of electric potential energy per coulomb of a charge is called potential energy known as voltage. Voltage = Electric Potential energy/coulomb of charge (potential energy) Voltage : measured in volts (V)

9. What’s the difference between potential energy and potential difference? Comparison using stair case: POTENTIAL ENERGY When you climb a set of stairs your body has to do work. The work you have done becomes potential energy

10. What’s the difference between potential energy and potential difference? Comparison using stair case: POTENTIAL ENERGY When you climb a set of stairs your body has to do work. The work you have done becomes potential energy When you climb up the stairs carrying a backpack you have to do more work then you will have gained more potential energy

11. What’s the difference between potential energy and potential difference? Comparison using stair case: POTENTIAL DIFFERENCE The height of the stairs is like the potential difference in a battery. (how much work is it going to do?)

12. What’s the difference between potential energy and potential difference? Comparison using stair case: POTENTIAL DIFFERENCE The height of the stairs is like the potential difference in a battery. (how much work is it going to do?) The mass you carry up the stairs is like the charge separated in a battery

13. Therefore: Potential energy in a battery comes from the potential difference (volts) and the amount of charge that has been separated (coulombs) Voltmeter:

14. Therefore: Potential energy in a battery comes from the potential difference (volts) and the amount of charge that has been separated (coulombs) Voltmeter: A device that measures the amount of potential difference between two locations of charge separation. When you place the two wires on opposite terminals (-,+) the voltmeter tells you the voltage.

15. Producing voltage

17. HOW DO BATTERIES PRODUCE VOLTAGE? 1) A battery has two terminals (-,+) 2) The electrodes are usually made of two different types of metals

18. HOW DO BATTERIES PRODUCE VOLTAGE? 1) A battery has two terminals (-,+) 2) The electrodes are usually made of two different types of metals 3) These electrodes sit in an electrolyte solution (a solution that conducts electricity)

19. HOW DO BATTERIES PRODUCE VOLTAGE? 1) A battery has two terminals (-,+) 2) The electrodes are usually made of two different types of metals 3) These electrodes sit in an electrolyte solution (a solution that conducts electricity) 4) The electrolytic solution breaks atoms off one of one of the electrodes leaving some of the electrons behind (becomes negative)

20. HOW DO BATTERIES PRODUCE VOLTAGE? 1) A battery has two terminals (-,+) 2) The electrodes are usually made of two different types of metals 3) These electrodes sit in an electrolyte solution (a solution that conducts electricity) 4) The electrolytic solution breaks atoms off one of one of the electrodes leaving some of the electrons behind (becomes negative) 5) At the same time electrons are pulled off the other electrode making it positively charged.