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what can you say for Resistance in both of these?

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We found that a fixed resistor obeyed Ohm's Law whereas a lightbulb did not. This could be seen through the graphs; the graph for the fixed resistor had a straight gradient going through the origin, whereas the graph for the lightbulb had a curved gradient. Since the gradient of the lightbulb graph is curved, it means that current (I) is not proportional to potential difference (V). For the fixed resistor, however, is directly proportional because it has a straight line gradient going through the origin.

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When gradient is less steep = Higher resistance

When gradient is more steep = Lower resistance

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Wire that is hot applies thermal energy
This causes the positive ions to gain more kinetic energy
So they vibrate more
Making it harder for electrons to flow

Hot Wire = High Resistance
Cold Wire = Low Resistance

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Current:
- Proportional to voltage
- Inversely proportional to resistance

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IV or current-voltage characteristics refers to the relationship in a current-voltage curve.

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State: It does obey Ohm's Law (Ohmic)
Describe: Straight line gradient going through origin
Explain: I is directly proportional to V; Therefore resistance is constant.
- Temperature must be constant

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State: It does not obey Ohm's Law (Non-Ohmic)
Describe: Curved gradient
Explain: I is not proportional to V; Therefore resistance is not constant - it changes.

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Thin Wires = High Resistance
This is because there isn't a lot of space for the electrons to move

Thick Wires = Low Resistance
This is because there is more space for the electrons to move

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Essentially,
Resistance is the opposition to the flow of the current

Increase Resistance = Current Decreases
Decreases Resistance = Current Increases

Resistance is measured in Ω (pronounce it O-WU-NM-S)