Unit Test Answers

Linh builds a circuit from the diagram shown.

A component of a circuit changes, as shown below.

Look at the circuit diagram.

Which provides resistance in an electric circuit?

Measurements of two electric currents are shown in the chart.

What does voltage describe?

Dr. Eriksson is working on a material called selenium. She is adding a certain number and type of atoms to the selenium, which will control its conductivity.

Which unit is used to measure resistance?

A circuit has a current of 1.2 A. If the voltage decreases to one-third of its original amount while the resistance remains constant, what will be the resulting current?

According to Ohm’s law, which combination of units is the same as the unit for voltage?

Masako measures a circuit at 12 V and 2 A. Using Ohm's law, what can he calculate for the circuit?

A circuit has a current of 2 A. If the resistance in the circuit decreases to one-fourth of its original amount while the voltage remains constant, what will be the resulting current?