DAY 168

ESSENTIAL QUESTION: How can we build a motor out of magnets, wire, and a battery?

Goals: SWBAT...

1. Define resistance and Ohm's Law

2. explain why a switch must be closed in order for current to flow

3. describe how electrons flow in a circuit

4. create a successful simple circuit

WARM-UP (4min)

1. If an object is conductive what do you know it can do?
2. What are some materials that are conductive?
3. A ruler measures length in centimeters and millimeters. What does an Ammeter measure? In what unit does it measure that value?

4. Define Ohm’s Law; don’t just list the equation.

CLASSWORK

1. HW Review

What causes things to move? Pressure. For electrons in a wire, that pressure is called voltage. An AA or AAA battery has 1.5V of pressure. Enough to move small things like toys. Bigger toys (like an RC truck) require more pressure, so they use batteries with 3 or 7 or 11 volts.
What resists movement? Friction. For electrons in a wire, increased resistance slows their movement, and increases the temperature. (think about an iron or electric stove)
result of voltage pushing, and resistance resisting is... current (the flow of charge or the flow of electrons)

2. 168A: Circuit Simulation Lab

Lab / instructions are on Schoology.

Can't access the lab for today on schoology? Here's a backup link (LINK)

LEARNING AT HOME (HW)

3. 168B: What is current?

Now that you've had the chance to explore a circuit, and how energy flows through a wire, how can we calculate the current flow through a wire?

All will be answered.....in the 1st Flipping Physics video ever :-) ----->LINK

Questions:

1. Define "current"

2. Which of the following flows in wires? Proton, Electron, Neutron?

3. What is the direction "conventional current" would flow?

4. Copy the image of the Bohr Model of the atom. Where are the electron shells?

5. What's actually flowing, positive or negative charges?

6. So, again, which way does current flow?

7. Energy gets transmitted from a power plant to our homes/school via AC, but most of our devices use a transformer to convert to DC. Why?

8. Solve the current problem ("A") along with Mr. P

9. In the equation, Q=ne what do each of the variables (letters) stand for?

10. Solve for the number of electrons flowing through the wire

11. is that a lot of electrons?