Section 2

Question 1

Superconductors

Answer 1

substance with no resistance to electron flow.

Question 2

Resistors

Answer 2

device having resistance to the passage of electrical current.

Question 3

Resistance

Answer 3

measure of how difficult it is for electrons to flow through a substance.

Question 4

Ohms

Answer 4

the unit of resistance.

Question 5

Variable resistor

Answer 5

resistor whose resistance can be changed by adjusting the portion of the resistor the current travels through.

Question 6

Rheostat

Answer 6

continuously variable resistor used to regulate electric current .

Question 7

Ohm’s law

Answer 7

law stating that, as long as the temperature remains constant, the resistance of a conductor remains constant, and the current is directly proportional to the voltage applied.

Question 8

Voltage drop

Answer 8

voltage across a resistor or other device in a circuit.

Question 9

Millivoltmeter

Answer 9

instrument used to measure small voltages.

Question 10

Ammeters

Answer 10

meter used to measure electrical current in amperes.

Question 11

Galvanometers

Answer 11

device for detecting and measuring small electric currents.

Question 12

Multimeters

Answer 12

meter that can measure voltage, current, or resistance in a circuit.

Question 13

Schematic Diagram

Answer 13

diagram using standardized symbols to show the components and connections in a circuit.

Question 14

Series Circuit

Answer 14

circuit in which there is only a single pathway for the current so the same current passes through all the components.

Question 15

Parallel Circuit

Answer 15

circuit in which the current can flow in two or more paths.

Question 16

Transistor

Answer 16

device usually with three layers arranged such that a small voltage through the middle layer controls a current between the outer layers, allowing the device to act as a switch or amplifier.

Question 17

Microcircuits

Answer 17

circuit made up of miniaturized components, especially an integrated circuit.