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## Current

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**Amount of electric charge that passes by a point in an**amount of time. • Unit is called Amps • # of coulombs each second • Measurement of the flow of electrons**I = Current (amps)**Q = Charge (coulombs) T = Time (seconds)**Demonstration**• We counted the number of cups that passed a location in a circuit in an amount of time • We could then determine the number of cups which pass that location each second • AMPs; # of coulombs (cups) per second**6 Cups (coulombs) pass a point in a circuit in 1 second.**• Find the AMPs of current**6 Cups (coulombs) pass a point in a circuit in 2 seconds.**• Find the AMPs of current**6 Cups (coulombs) pass a point in a circuit in 3 seconds.**• Find the AMPs of current**6 Cups (coulombs) pass a point in a circuit in 6 seconds.**• Find the AMPs of current**Voltage**• Measurement of the stored energy by separating electrons • Amount of energy on each charge. • Volts • # of joules on each coulomb**V = Voltage (volts)**E = Energy (joules) Q = Charge (coulombs)**Demonstration**• Cups can hold different amounts of water • Coulombs can have different amount of energy • The amount of water depends of how much water is available in a pail • The amount of energy depends on the voltage of the battery**1 Volt battery puts 1 drop in the cup**• 2 Volt battery puts 2 drops in the cup • 3 Volt battery puts 3 drops in the cup 12 11 10 9 8 7 6 5 4 3 2 1**A 6 Volt battery loads 6 Joules of energy (drops of water)**onto each coulomb of charge (cup) 6J**A 12 Volt battery loads 12 Joules of energy (drops of water)**onto each coulomb of charge (cup) 12J**Direct Current**• Flow of electrons in one direction**Alternating Current**• Flow of electrons back and forth during regular cycles**What happens to the current in the charge doubles but the**time stays the same?**What happens to the current in the charge is halved but the**time stays the same?**What happens to the current in the charge stays the same but**the time doubles?**What happens to the current in the charge stays the same but**the time is cut in half?