Electricity Current and Charge Current Rate of flow of charge (rate of flow of electrons) Shared across elements in parallel Same across elements in series Charge Flow The number of electrons Equation Q = I * t charge (C) = current (A) * time (s) current (A) = charge (C) / time (s) Other Potential Difference Amount of energy transferred per unit charge Same across elements in parallel Shared across elements in series Resistance How difficult it is for current to flow through a circuit or component Summed in series Bit less than smallest value in parallel Equation V = IR potential difference (V) = current (A) * resistance (Ω) Circuit Symbols Battery Battery Cell Cell Diode Diode Lamp Lamp LED LED Switch Switch Switch but again