Electricity Charge and Current

For an electrical current to flow what two things are needed?

• A source of potential difference (e.g. battery)

• A switch

• A closed circuit (all the wires connected)

• An insulator

What is current?

• The flow of electric charge

• Potential difference

• The amount of energy

• Water in a river

Tags

NGSS.HS-PS2-5

What needs to be done to this circuit so that the lamp lights up?

• Close the switch

• Add a source and close the switch

• Add another lamp

• Add another lamp and a switch

What unit do we measure charge in?

• Coulombs (C)

• Amperes/Amps (A)

• Seconds (S)

• Volts (V)

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

What unit do we measure time in?

• Metres (m)

• Amperes/Amps (A)

• Seconds (s)

• Coulombs (C)

What unit do we measure current in?

• Watts (W)

• Candelas (cd)

• Volts (V)

• Amperes/Amps (A)

What symbol do we use for charge?

• A

• W

• Q

• Z

What symbol do we use for current?

• C

• A

• O

• I

What is the correct equation for current?

• current = potential difference / time

• current = charge flow x time

• current = charge flow / time

• current = time / charge flow

Tags

NGSS.HS-PS2-5

What charge will flow if I have a current of 10 amps and a time of 5 seconds?

• 15 coulombs

• 50 coulombs

• 0.5 coulombs

• 2 coulombs