CURRENT AND RESISTANCE

CURRENT AND RESISTANCE

Poll

cellphone

• AC

• DC

Poll

television

• AC

• DC

Poll

laptop

• AC

• DC

Poll

airconditioner

• AC

• DC

Poll

lightstick

• AC

• DC

Poll

remote

• AC

• DC

Poll

scientific calculator

• AC

• DC

Poll

amplifier

• AC

• DC

Poll

wall clock

• AC

• DC

Open Ended

Analyze the illustration and share your thoughts.

Factors that may affect the resistance of a uniform wire:

• Cross-Sectional Area

• Length

• Material of Wire

• Temperature

Cross-Sectional Area ∝ 1/Resistance

Length∝Resistance

Material of a Wire

• CONDUCTORS: aluminum, copper, iron, tungsten, steel

• SEMICONDUCTORS: pure carbon, pure germanium, pure silicon

• INSULATORS: amber, glass, wood, rubber

Multiple Choice

Longer wire

• The resistance will increase.

• The resistance will decrease.

Multiple Choice

What will happen to the resistance of an insulator as temperature increases?

• The resistance will increase.

• The resistance will decrease.

Multiple Choice

narrow cross-sectional Area of a wire

• The resistance will increase.

• The resistance will decrease.