Lesson 3

How is resistance related to electric current?

• Resistance is directly proportional to electric current

• Resistance and electric current are always equal

• Resistance and electric current are inversely proportional

• Resistance causes electric current

In a closed loop circuit, what is the state of the light bulb?

• Dimly lit

• Lit

• Flickering

• Receiving no power

What unit is used to measure Electromotive Force?

• Ampere

• Ohm

• Watt

• Volt

Which factor increases resistance in a conductor?

• Increasing the conductor length

• Increasing the cross-sectional area

• Decreasing the temperature

• Using a shorter conductor

What is the definition of Electromotive Force (EMF)?

• The potential energy given to a unit of charge to make it flow through a conductor

• The force that causes electrons to move

• The energy required to move a charge

• The rate at which electric current flows through a conductor

Which factors can affect electrical resistance?

• Temperature and material

• Voltage and length

• Current and voltage

• Length and cross-sectional area

What is the unit for resistance?

• Ohm meter

• Meter

• Meter squared

• Ohm

In a series circuit, how does the total resistance compare to individual resistances?

• The sum of the individual resistances

• The reciprocal sum of the individual resistances

• Less than the lowest individual resistance

• Equal to the lowest individual resistance

What is the difference between conventional current and electron flow?

• Conventional current is from positive to negative while electron flow if from negative to positive.

• Conventional current is from negative to positive while electron flow if from positive to negative.

• Conventional current is for series circuit while electron flow is for parallel circuit.

• Conventional current is for parallel circuit while electron flow is for series circuit.

What is the relationship between voltage and current?

• Inversely proportional

• Directly proportional

• They don't affect each other.

• Cannot be determined