Exam (elaborations)
Resistance and Ohm's Law
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Resistance and Ohm's Law
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● Resistance and Ohm's Law●
✅A flow of electrons along a wire
What is electricity?-
What happens when electrons move along the wire?-✅As the electrons
move along the wire, they collide with the metal atoms. These collisions
make the atoms vibrate more, which makes the metal hotter
✅
What is resistance a measure of?- Resistance is a measure of how much
a material tries to stop electricity from passing through it
✅
Why do appliances waste energy?- All wires and devices have some
resistance, which is why electrical appliances always waste some energy
as heat
What is a resistor?-✅A component designed to reduce the current
What is a variable resistor?-✅It has a resistance that can be changed
What is a fixed resistor?-✅It has a resistance that remains the same
What affects resistance?-✅Material
Thickness
Temperature
Length
How does material affect resistance?- ✅Some materials allow electricity to
flow through easier, such as copper
How does thickness affect resistance?- ✅Increasing thickness decreases
resistance
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