GCA Physical Science SPS10.a Review

What is the unit we use to measure electric current?

• ampere (amp)

• ohm

• volt

• newton

If the voltage stays the same and resistance is increased, current will ________. 

• Increase
• Decrease
• Stay the same
• Not enough info

In a circuit, if the voltage is increased and the resistance stays the same, current will ____.

• Increase, because voltage and current are directly proportional.

• Decrease, because voltage and current are directly proportional.

• Decrease, because voltage and current are indirectly proportional.

• Increase, because voltage and current are indirectly proportional.

A light circuit is operating at 75 Volts. What is the circuit's current if the resistance is 5 Ohms?

• 375 Amps
• 50 Amps
• 15 Amps
• 0.07 Amps

What unit is used to measure resistance?

• Ohms

• Omega

• Volts

• Amps

What is the resistance of a lightbulb that experiences 9 Volts and 3 amps of current?

• 1/3 ohms

• 3 ohms

• 27 ohms

• 9 ohms

What is the voltage of a circuit with 4 ohms of resistance and 3 amps of current?

• 12 V

• 21 V

• 4/3 V

• 3/4 V

The mathematical relationship among Voltage, Current, and Resistance

• Faraday's Law
• Tesla's Law
• Edison's Law
• Ohm's Law

If the voltage in a circuit doubles, the current will be

• tripled.

• doubled.

• cut in half.

• quadrupled.

The light bulb has 100 Ohms of resistance. What will happen to the current if it is replaced with a bulb that has 300 Ohms of resistance?

• The current will become 3 times stronger.

• The current will decrease to 1/3rd the strength.

• The current's strength will double.

• The current will be half as strong.