10 Electric circuits basics

Voltage is

• the energy per unit charge

• the rate of flow of charge

• the energy per unit time

• the charge per unit time

Current is

• the energy per unit charge

• the rate of flow of charge

• the energy per unit time

• the charge per unit energy

Power is

• the energy per unit charge

• the rate of flow of charge

• the energy per unit time

• the charge per unit time

Resistance is

• the energy per unit charge

• the rate of flow of charge

• the ratio of voltage to current

• the charge per unit time

Why electrical wiring usually are covered with a layer of plastic?

• To make it look pretty

• To help electricity flow along the wire

• To make it safe

• To add more energy

Tags

NGSS.MS-PS1-3

Why is electrical wiring usually made from copper?

• Because copper is shiny

• Because copper conducts electricity well

• Because copper is not magnetic

• Because copper carries electricity well

Tags

NGSS.MS-PS1-2

1. Which switch or switches must be closed to make both the lamps light?

• Only switch 1

• Only switch 1

• Switches 1 and 2

• Switches 1 , 2 and 3

If lamp 1 is unscrewed from its holder, what will happen to lamp 2?

• It will get brighter

• It will stay the same brightness

• It will go out

• Nothing will happen

Tags

NGSS.MS-PS2-3

A current of 5.0 A flows in a resistor for 25 s. How much charge has passed through the resistor in this time?

• 125 C

• 5.0 C

• 0.20 C

• 5.0 A

A battery supplies 15.0 C of charge at a voltage of 12 V. How much work has the battery done on this charge?

• 12.5 J

• 180 J

• 0.80 J

• 12.5 W