Topic 3: Resistance

Question 1

Resistance

Answer 1

• Measure of how difficult it is for electrons to move through substance
• Property that tries to slow movement of electric charge and converts electric charge into other forms of energy
• Measured in Ohms () ohmmeter

Question 2

Current

Answer 2

• How fast electric charges are moving
• Measured in amps (A)

Question 3

Voltage

Answer 3

• Pressure from an electrical circuits power source that pushes electrical charges through circuit
• Measured in volts (V)

Question 4

Resistor

Answer 4

• Conductor
• Allows electricity to pass but provides resistance to it
• Limits amount of current in circuit

Question 5

Relationship of Conductors and Resistance

Answer 5

• Good conductors - more electrons going through - less resistance
• Bad conductors - less electrons going through - more resistance
• More resistance substance has = more energy substance gains. Energy is radiated into surroundings as heat or light

Question 6

OHM’s Law

Answer 6

As long as temperature stays the same:
1. The resistant of the conductor will stay consistent
2. The current will be the same as the voltage applied

*If you increase the voltage of a circuit, the current will also increase

Question 7

OHM’s Law Calculations

Answer 7

Resistance = Voltage (v)/current(i)
Current = voltage/resistance
Voltage = resistance x current

Question 8

Variable Resistor

Answer 8

• Resistor in which electric resistance can be adjusted

Question 9

Rheostat

Answer 9

• Can increase or decrease amount of current in the circuit
  by adjusting the portion of the resistor the current travels through
  Ex. volume controls

Question 10

Series Current

Answer 10

• Only one pathway for the current
• If pathway is interrupted whole circuit cannot function
• Adding stuff increases resistance, decreasing current
  Ex. adding another lightbulb makes all lightbulbs dimmer
  Ex. light switches

Question 11

Parallel Circuits

Answer 11

• Have a secrete current paths in circuit
• Circuit still works if passageway is interrupted
• Adding stuff decreases resistance
• If you cit off an area of circuit other area will have more current (why circuit breakers are a thing)