20.3 electric circuits

 a continuous, closed path along which electrons can move.

circuit

what are the parts of a circuit?

battery (cell)

wire

resistor

switch

source of electrons

provides voltage

battery (cell)

path for the electrons to travel

wire

a device that uses electrical energy to do work

resistor

where is filament?

filament

good conductors have ___, poor conductors have ___ resistance

low

high

long, thin wires have ___ resistance than short, thick wires

higher

opens and closes the circuit

swithc

open= ___ (lights __)

closed= ___ (lights ___)

off

on

what do fluorescent bulbs contain?

inert gas within the glass casing

what are LEDs?

solid state technology

what do incandescent light bulbs contain?

a filament

electrons must flow from the ___ to the __, and back to the battery for the circuit to work

battery

resistor

what are the two types of circuits

series and parallel

a circuit that has only one path along which electrons can flow. if one light goes out, they all go out

series circuit

a circuit that has more than one path along which electrons can flow. if one light goes out, the others remain lit

parallel

what are the 2 types of cells (batteries)

dry cell

wet cell

the electrolytes is a dry paste

dry cell

a substance through which charges can move

electrolyte

the electrolyte is a liquid (acid)

wet cell

electrodes are usually ___ (-) and ___ (+)

zn cu

power is equal to voltage mulpitled by current

electric power

formula for electric power

P= V x I

power unit

watts

energy is equal to power multiplied by time

electrical energy

electrical energy formula

E= P x t

electrical unit

watt-hour or kilowatt-hour

where does electrical energy happen?

in your home

 a device with a metal strip that burns away when too much current passes through a circuit. 

fuse

what does a fuse prevent?

a cicuit from getting overloaded

a resettable switch that opens when the current passing through a circuit is too high. 

circuit breaker