Current, Voltage and Resistance

Resistance is

• Measured using an ammeter

• Units are 'volts'

• How difficult it is for electrons to move through an object

• The continuous movement of electrons in a wire

A conductor has _____ resistance. An insulator has ______ resistance.

• Low; high.

• Negative; positive.

• Positive, negative.

• High, low.

Tags

NGSS.HS-PS2-5

A resistor

• Is the same as resistance

• Is connected to a circuit in parallel

• Is used in a circuit to control the amount of current

• Is not measured in ohms

A student uses a length of wire as a resistor. He makes a second resistor from the same material. To be certain of making a second resistor of higher resistance, he should use a piece of wire that is:

• longer and thicker.

• longer and thinner.

• shorter and thicker.

• shorter and thinner.

Which symbols are used for the units of current and of resistance?

• A

• B

• C

• D

Tags

NGSS.HS-PS2-5

Which two changes to a metal wire both increase resistance?

• decreasing its length and increasing its temperature

• increasing its length and decreasing its temperature

• decreasing its thickness and increasing its temperature

• increasing its thickness and decreasing its temperature

What is the unit of measure for current?

• ampere

• current

• voltage

• ohms

What unit of measure is for resistance?

• ohms

• ampere

• voltage

• watts

What moves when we say that there is current?

• inductors

• conductors

• electrons

• atoms

Tags

NGSS.HS-PS2-5

How do you calculate voltage?

• Current X Resistance

• Resistance ÷ Current

• Current ÷ Resistance

• Measure it with a ruler