Energized and De-Energized Charges

1. Energized and De-Energized Charges

2. Zap……. • Lightning and sparks involve very brief moments of intense electric discharge • In a circuit the movement of electrons is continuous and controlled • Still, the reasons the electrons move are similar…

3. Batteries • Excess of electrons accumulates at one terminal of the battery – negative charge • Electrons withdraw from the other terminal – positive charge. • The energy comes from chemical reactions. • Stored energy is called potential energy

4. Electrical Energy • All energy is measured in joules (j) • When describing the energy of electrons in a circuit we talk about the potential energy • We always compare one point in the circuit to another. (positive termininal to negative terminal) • Volts = Joules per Coulomb • V = E / Q

5. Potential Energy • In a battery… • 45 J of chemical energy • Converted to electrical energy by separating + and - • This energy places 15 C of -charge at the - terminal • There is a deficit at the + terminal • What is the POTENTIAL DIFFERENCE (VOLTAGE) between the negative and positive terminals? • E = 45 J • Q = 15 C