Resistance

Multiple Choice

What is resistance?

• The flow of electrons

• Electric potential difference

• Rate of flow of electrons

• The ability to reduce the flow of electrons

Multiple Choice

How does resistance affect current?

• less resistance - less current

• more resistance - less current

• more resistance - more current

• resistance does not affect current

Multiple Choice

As the resistance of a circuit increases, the current will

• increase

• decrease

• stay the same

Multiple Choice

As the resistance of a circuit decreases, the current will

• increase

• decrease

• stay the same

Multiple Choice

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

• 12Ω

• 6Ω

• 24Ω

• 0.167Ω

Multiple Choice

What is the unit of resistance

• Ohm

• Home

• Amp

• Camp

Multiple Choice

Voltage is measured in __.

• volts.

• watts.

• coulombs. 

Multiple Choice

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

• I = V²R

• I = V/R

• I = R/V

• I=VR

Multiple Choice

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

• 1 Ohm

• 3 Ohms

• 4 Ohms

• 12 Ohms

Multiple Choice

How do you calculate resistance?

• Current x Voltage

• Voltage x Power

• Voltage ÷ Current

• Current ÷ Voltage

Multiple Choice

The unit electric current is measured in is

• Volt

• Ampere

• Newton

Multiple Choice

Does this diagram represent a series or parallel circuit?

• series circuit

• parallel circuit

Multiple Choice

If a circuit has two resistors in parallel both are 4Ω, what is the total resistance of the circuit?

• 1Ω

• 2Ω

• 4Ω

• 8Ω

Multiple Choice

Which resistor has the biggest voltage across it?

• 2 Ω

• 3 Ω

• 4 Ω

• all have the same

Multiple Choice

The total resistance in this circuit is

• 100 ohms

• 450 ohms

• 400 ohms

• 30 ohms

Multiple Choice

The following diagram shows part of a closed electrical circuit. The electrical resistance of the part of the circuit shown between point X and point Y is

• 1.33 ohms

• 2 ohms

• 2.75 ohms

• 4 ohms

• 6 ohms

Multiple Choice

Which wire has more resistance (long or short)?

Multiple Choice

Which wire will have the least resistance?

• 10 cm

• 20 cm

• 30 cm

• 40 cm

Multiple Choice

How does the thickness of a wire affect resistance?

• A thicker wire has more resistance

• A thinner wire has more resistance

• Thickness of a wire does not affect resistance

Multiple Choice

If the length of a wire increases, the resistance ____________

• a. decreases

• b. increases

• c. stays the same

• d. unknown

Multiple Choice

Wire A has twice the cross sectional area of wire B. The resistance of wire A is __________________ wire B.

• 1/4 as much as

• 1/2 as much as

• the same as

• twice as much as

Multiple Choice

A copper wire of length 2.5 m and cross-sectional area 2.4 × 10^-7 m² has a resistivity of 1.7x10^-8Ωm. What is the resistance of the wire?

• 1.6x10^-15Ω

• 1.0x10^-14Ω

• 0.18Ω

• 5.6Ω

Multiple Choice

Which factor does not affect resistivity?

• Length

• Mass

• Cross-sectional area

• Temperature