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• In a circuit with a battery or chemical cell, electrons flow from a negative terminal to a positive terminal through the circuit
• Conductors are materials through which a current can flow
• Metals are good conductors
• Other materials like carbon or water are also good conductors
• Schematic diagrams are diagrams of electric circuits
• Symbols are used to represent different parts of an electrical circuit
Series and Parallel Circuits
• Series circuits have a single pathway for the current
• Parallel circuits have more than one pathway for the current
Current
• a measure of the number of charged particles passing a point in a given time
• measured in amperes (A) or amps
• 1A = 1 coulomb of charge per second
• Symbol for current is I
Conventional Current
• In an electric circuit, electrons actually flow from the negative terminal to the positive terminal
• In conventional current, we assume they are flowing from positive to negative
Voltage
• a measure of the amount of electrical energy carried by each charged particle in a circuit
• measured in Volts (V)