Science 9 Batteries and Voltage Name ______________________ =============================================================================== ELECTROCHEMICAL CELLS (Batteries) - pg. 306-307 Batteries are also known as electrochemical cells since they use a chemical reaction to produce electricity. Due to this chemical reaction, electrons build up on the negative terminal of the battery. When connected in a circuit, the electrons move from the negative terminal to the positive terminal (and power things along the circuit). 1. Identify 8 different types of batteries … AA Vehicle 2. Label the diagram below using the following terms… Negative terminal Positive terminal Anode Cathode Electrolyte 3. On the diagram above, use arrows to show the direction the electrons flow thought the circuit. 4. When is a battery “dead”? 5. What is the difference between a dry cell and a wet cell? 6. What is the difference between a secondary cell and a primary cell? 7. Why is it unsafe to recharge primary cells? 8. Why do batteries have an expiry date on their label? 9. How do companies that produce devices which run on batteries ensure the batteries are installed correctly? ============================================================================================ ELECTRIC POTENTIAL (Voltage) - pg. 302-303 When the chemical reaction occurs in a battery, it builds up a stockpile electrons. These electrons were given a certain amount of energy from the chemical reaction. The electrons will carry this electrical potential energy until they flow through a circuit and give up their energy to something that needs it (ex: light bulb). 10. Define “electrical potential”. 11. What is the unit of electrical potential? 12. How many volts is a … a. Wall outlet in a house? b. Square battery?