Electricity Unit Review

Which of the following items found in most homes could be used to make an electrochemical cell?

• A bread bag, water, and a lemon
• An iron nail, a copper penny and a lemon
• A ceramic plate, cooking oil, and an aluminum fork
• A stainless steel spoon, milk, and a stainless steel fork

Which of the following options correctly describes the above circuit diagram?

• Two lamps are receiving electricity from a power source.  Each lamp is separately controlled by a switch.  The electrons go through the switch before the lamps.
• Two lamps are receiving electricity from a power source.  Each lamp is separately controlled by a switch.  The electrons go through the lamps before the switch.
• Two lamps are receiving electricity from a power source.  Both lamps are controlled by the same switch.  The electrons go through the switch before the lamps.
• Two lamps are receiving electricity from a power source.  Both lamps are controlled by the same switch.  The electrons go through the lamps before the switch.

The most common type of energy loss in electrical devices is ...

• thermal
• potential
• chemical
• mechanical

How will two acetate strips charged in the same way react to each other?

• They will attract one another.
• They will repel one another.
• They will not affect one another.
• They will neutralize one another.

When an uncharged object loses electrons, it becomes...

• fully charged.
• negatively charged.
• neutral.
• positively charged.

Which of the following are among the laws of static electricity? I. Similar charges attract. II. Similar charges repel. III. Opposite charges attract. IV. Opposite charges repel.  V. Neutral objects are attracted to charged objects.

• I, IV, and V
• I, II, and V
• II, IV, and V
• II, III, and V

Materials that do not allow a charge to move freely on or through them are called...

• conductors.
• unbalanced.
• balanced.
• insulators.

If a material is to be classified as a good electrical conductor, it must...

• hold its electrons tightly.
• have no electrons
• hold its electrons loosely
• have electrons that are neutral

What is the best way to measure the current through the circuit illustrated above?

• Detach the circuit and attach a voltmeter into the circuit.
• Place the test probes of a voltmeter on either side of the lamp.
• Detach the circuit and attach an ammeter into the circuit.
• Place the test probes of an ammeter on either side of the lamp.

Ross uses a voltmeter to measure the potential difference across different points in the circuit illustrated.  Across which two points will the potential difference be the lowest?

• Between the positive and negative terminals of the battery.
• Across the lamp.
• Across the two sides of the switch.
• Between the lamp and positive end of the battery.