2. 1. What is the current across each resister?
10/2 Warm up
From yesterday’s exit slip
Tomorrow: BM assessment
Notebook check from 9/22
Using V= I * R
P = I * V
The current above has a 10 volt power source. The value of the resisters are
r1= 1, r2= 5, r3= 10
1. What is the current across each resister?
What is the total current?
3. What is the complete resistance?
4. What is the power going through the battery?
1. R1 = 10v /1 O = 10A
R2 = 10 v / 5 = 2 a
R3 = 10/10 = 1 a
2. Total current = 13 A (resisters added together)
3. Complete resistance R = V / I volts / 13 amps = .77
4. P = I *V 13A*10 V = 130 watts

3. The voltage of the above is 6 volts, each resister is
How could you calculate the power going through the circuit

4. What makes something an insulator and a conductor?

5. Conductors - materials where electrons can move anywhere
Insulators – atoms hold electrons tightly

6. How does a battery work?
What are the requirements for a circuit?
a voltage source
A conductor
The voltage from the battery pushed the electrons through the circuit

7. How do you calculate a voltage drop? In a parallel and in a series?
In a parallel the voltage is the same across each branch as it is across the battery
In a series the voltage is divided amoung resistors

8. V=I*R
What is the current across the circuit?

9. What is the current across each branch? What is the total current?
What is the total resistance?
The current is 1 amp and 3 amps
The total current would be 4 amps
R=v/I 12v/4 = 3 ohms

10. How are magnetic fields created in a wire?
When electricity flows through the wire magnetic fields are created

11. What needs to be done to create electricity?
What are the three requirements
Go Green Tigers!
Magnet, coil, movement – the most important thing learned in class

12. A 120 volt charger has 100 turns with the secondary coil has 20 turns
A 120 volt charger has 100 turns with the secondary coil has 20 turns. What is the output voltage?

13. Green tigers!

14. 2/28 Why is the generator harder to turn when the bulb is lit?
Create a picture of 3 bulbs in series.
Create a picture of 3 bulbs in parallel.
Monday – benchmark assessment for electricity
More energy is put into the bulb when it is lit.

15. Say the following circuit is hooked up to a 40 volt source.
What is the current going across each branch? What is the current across the battery? What is the voltage drop across each battery?
What is the current across the battery in the picture above?

16. The diagram shows a light bulb connected by wires to the + and – terminals of a battery. Comparing the electric potentials at points A and D we find that the electric potential at point A is _________compared to point D.
a. 12 V higher
b. 12 V lower
c. exactly the same
d. impossible to tell
Battery supplies the voltage which causes the electrons in a circuit to move.
How does a battery work?

17. 37.3 Generators and Alternating Current
It is more practical to move the coil instead of moving the magnet, by rotating the coil in a stationary magnetic field.
A machine that produces electric current by rotating a coil within a stationary magnetic field is called a generator.
A generator is essentially the opposite of a motor, converting mechanical energy into electrical energy.

18. 37.4 Motor and Generator Comparison
When a current moves to the right, there is a force on the electrons, and the wire is tugged upward.
When a wire with no current is moved downward, the electrons in the wire experience a force, creating current.

19. 3/3
Create a schematic diagram of 2 bulbs in series with a 9 volt battery.
What is the difference between electric potential and electric potential energy?
Ammeter – device that measures current.

20. Electric potential – volts energy per unit charge.

21. 3/4 How is the assessment going?
What percentage of the questions do you think you are going to get correct?
What is one area you are doing well on?
What is one area that is giving you a hard time
80% high, mean is 45%