Electricity Review

What is the unit of measurement for resistance?

• Voltage

• Ampere

• Watts

• Ohms

What is Resistance?

• the degree to which a circuit component opposes the passage of an electric current, causing energy dissipation
• How hard the energy is pushed
• The amount of charges that pass by a given point per second
• None of the above

Which resistor will prevent the most current flow?

• 1 ohm
• 100 ohms
• 1000 ohms
• 0.5k ohms

How does resistance affect current?

• less resistance - less current
• more resistance - less current
• more resistance - more current
• resistance does not affect current

the formula to find current when the values of V and R are known is

• A = V²R

• A = V/R

• A = R/V

• A = VR

What size resistor would produce a 3 Amp current flow with a 12 Volt battery

• 1 Ohm
• 3 Ohms
• 4 Ohms
• 12 Ohms

How do you calculate resistance?

• Current x Voltage

• Voltage x Power

• Voltage ÷ Current

• Current ÷ Voltage

What happens to resistance when the length of the wire increases?

• Stays the same

• Increases

• Decreases

If the current through a resistor is 2A and the voltage across it is 12V, what is the resistance

• 12Ω

• 6Ω

• 24Ω

• 0.167Ω

What effect do electrons flowing through a resistor have on the resistor.

• make it glow

• reduce it's resistance

• increase it's resistance

• heat it up