Unit 7 Physics Electricity Review

A student connects a length of unknown material in series with a battery and an ammeter (which measures current flow). When the circuit is complete, the ammeter reads that no current is flowing. The unknown material is most likely ​ ​ (a)  

• an insulator
• a conductor
• a superconductor
• a semiconductor

Tags

NGSS.HS-PS2-6

Silicon is a substance often used in electronic devices. Silicon has a high electrical resistance compared to metals which means that it does not release its electrons very easily. However, it does conduct electricity when the right conditions are met. These properties allow electronic devices to control the electrical current sent through silicon much easier than a typical metal substance.

The properties of silicon would cause it to best be classified as a ​ ​ (a)  

• semiconductor
• conductor
• insulator
• superconductor

Which of the following, on average, has the highest electrical resistance value?

• conductors

• insulators

• semiconductors

• superconductors

A cell phone company is trying to improve their chargers so that the battery charges faster. Based on the information above, which material would be the best to use when making the cell phone charger cable?

According to the above diagram, what is the equivalent resistance of the circuit?

• 0.96 Ω

• 1.21 Ω

• 20 Ω

• 284 Ω

Using the diagram above, what is the current leaving the battery?

• 0.40 A

• 2.50 A

• 8.33 A

• 10.67 A

What is the power output in Watts of a lightbulb connected in series to a 1.5 V battery if the current flowing through the circuit is 0.5 A? Record your answer. Be sure to use the correct place value.

Mathematical Equivalence

ON

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

How many Joules of energy is dissipated by a resistor each minute if the voltage drop across it is 2 V and the current passing through it is 0.1 A? Record your answer. Be sure to use the correct place value.

Mathematical Equivalence

ON

The newest generation of smart phone uses three different batteries connected in a series simultaneously to extend battery life and generate the energy necessary to power the device. If each battery is rated at 2.4 V, what is the overall voltage provided to the phone?

Mathematical Equivalence

ON

A student is attempting to create a circuit that will generate the maximum amount of heat possible. All resistors have equivalent length, area, and shape.

Which of the following would be most effective in generating heat?