Electrical Resistance

What are the units for electrical resistance?

• ohms

• joules

• volts

• amps

In a wire, _________________ flow from negative to positive

• metal atoms

• resistors

• electrons

• ohms

A 25 ohm resistor is connected in series with a 15 ohm resistor. What is the total resistance?

• 10 ohms

• 375 ohms

• 40 ohms

• 9.4 ohms

A 25 ohm resistor is connected in parallel with a 15 ohm resistor. What is the total resistance?

• 80 ohms

• 375 ohms

• 40 ohms

• 9.4 ohms

Substances with high resistivity such as plastics and ceramics.

• conductors

• insulators

• semiconductors

• fixed resistors

The resistance of a piece of wire does not depend on _________________.

• wire material

• wire mass

• wire length

• wire cross sectional area

Ohm's law is ________________

• R = V X I

• V= I X R

• I = R X V

• V = I / R

The voltage is 5 Volts. The Resistance is 25 ohms. What is the current?

• 5 A

• 0.2 A

• 20 A

• 125 A

If the resistance remains the same in a circuit but the current increases, what happened to the voltage?

• increases

• decreases

• remains the same

• unknown

If the voltage remains the same in a circuit but the resistance increases, what happens to the current?

• increases

• decreases

• remains the same

• unknown