# physics

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 Author: Snoopy ID: 262268 Filename: physics Updated: 2014-04-03 20:59:03 Tags: electric Folders: PHYS9 Description: this explains ch25-29 Show Answers:

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1. Coulomb's law
F1 on 2 =K|q1||q2|/r2

• k= 9 * 10-9  Nm2/C2
• q is the charges or electrons between two points

r is the distance, not half the distance or radius

2. resistor vs battery
• battery- source
3. potential energy that the charges gain in the battery is subsequently lost as they fall thru the resistor
4. battery supplies potential difference and also energy to the circuit
5. what is the rate at which energy is transfered
power. J/s or W
6. charge gains potential energy as it goes up the battery

battery supplies energy as it lifts charge q from the negative to the positive terminal
7. battery is the source of emf
8. ammeter
measures the current in a circuit element. Must be place in series
9. power dissipated by a resistor
P=I2R
10. resistors in series
group of resistors > any single resistance in a group
11. resistors in parallel
group of resistors < single resistance in a group
12. what happens when the switch is close?
closing decreases circuit resistance and thus increases current leaving the battery
13. voltmeter
measures the potential difference across an element. Must be place in parallel
14. being grounded doesn't affect the circuit's behavior
15. time constant
Resistor * Capacitor
16. capacitor at charge Q. This can also be a decay
Q=Q0e-t/T
17. capacitor voltage decay
ΔV= ΔV0e-t/T

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