# Physics Ch 22

## 21 terms

A

increase

stays the same

1

V=IR
110=(I)(55)
I=2

V=IR
V=(2)(60)
V=120

fuse

circuit breaker

Amp

Watt

Volt

Ohm

V/I =rise/run

### 2 reasons why a house is wired in parallel

-lights in series get dimmer as more lights are added
-if one light goes out in series, they all go out

### Why don't insulators conduct energy?

Insulators do not allow electrons to move from atom to atom like conductors

### What is the purpose of a fuse and circuit breaker and explain 2 ways a fuse differ from a circuit breaker?

They limit the amount of current that can travel through the walls.
-fuse can't be reused
-differ in way they disconnect

### Why shouldn't you use multiple surge protectors with multiple outlets in your dorm room?

The more resistors, the more current, therefore, the hotter the wall

### Describe 3 new things you learned from the lab

1. do not test resistors when a power source is in the circuit
2. Test the current by wiring the multimeter in series
3. Test for voltage drop by wiring the multimeter in parallel

### In order to carry electricity across long distances it is carried at higher voltage. Explain how this helps reduce joule-heating loss.

Loss of power because resistance in wire, prevent it by reducing the current by increasing the voltage

1. material
2. length
3. temperature

yeah...