Download - Insulators and Conductors
• Electric Circuit– Current provided by battery flows through wire,
into the light bulb, through another wire, and back to the battery.
• Current: flow of electrons
Insulators and Conductors
Conductor lets electrons flow
Insulator doesn’t let electrons flow
Electric lam
p
(glo
win
g)
Electric lam
p
(no
t glo
win
g)
Insulators and Conductors
Insulators hold electrons close like a dog on a leash
Conductors let electrons flow like dogs running free
Atom
Insulators let electrons flow like dogs running free
• Resistance: How much the material resists the flow of electrons
R = V / I• The higher the resistance, the slower the flow of
electrons, the smaller the power output
Resistance
R = ( x L) / A
R - Resistance - Density L - Length A -
Area
Higher Resistance
Lower Resistance
• Resistance: is like resistance to water flow in a hose. Larger diameter hose -less resistance, longer hose –more resistance
• Voltage like pressure, current like flow