Electrical Science T3 Gas

Fill in the blank: Volt (V) is the derived unit for electric potential, electric potential difference (voltage) and ________.

• electromotive force.

• current.

• resistance.

• capacitance.

What is the term for the opposition to electrical current in conductors?

• Voltage

• Resistance

• Capacitance

• Inductance

What is electrical conductivity a measure of?

• Resistance

• Current flow

• Voltage

• Power

What is resistivity measured in?

• Volts

• Amperes

• Ohms/meter

• Watts

What does the formula for resistance show about the relationship between resistance and length?

• A) Resistance is directly proportional to length

• B) Resistance is indirectly proportional to length

• C) Resistance is not related to length

• D) Resistance is inversely proportional to length

Fill in the blank: Increasing the area (size) of a conductor _______ the resistance.

• decreases

• increases

• does not change

• doubles

What is important when calculating the resistance of a circuit?

When converting a 1.5mm² cable, what does it become in meters?

• 1.5 meters

• 1.5mm² cable

• 15 meters

• 0.15 meters

What is the 'magic number' used for converting mm² to m²?

Using Ohm's law, calculate the resistance if a torch uses a 3V battery which takes a current of 0.3A. Use the formula V = IR.

• 10 Ohms

• 5 Ohms

• 1 Ohm

• 0.1 Ohm