Blog 1: 10 points from page 544-552

1. Electric current involves electrons repelling one another and passing through a conductor. Energized electrons, directed by a conductor, allow energy to be used to power many devices.


2. Electric current: the flow of charge.

3. Current (I): the rate of charge flow.

4. Formula for current is:

                                        I: Current in amperes (A)

                                        Q: Charge in coulombs (C)

                                         t: time in seconds

5. Conventional current is current flow from positive to negative while Benjamin’s theory was that it was from negative to positive

6. Ammeter: a device that measures current

7. Direct current (DC): current that flows from power supply through the conductor to a load in a single direction. Alternative current (AC): current that changes directions periodically.

8. Circuit: the path of current and is mandatory for an electrical device.

9. Electric potential difference (V): electrical potential energy for each coulomb of charge in a circuit. Also known as voltage. Formula for potential difference is:

                                                                 V=E/Q

                                               V: Voltage/potential difference

                                                               E: Energy

                                                               Q: Charge

10. Coulomb = a group of electrons

11. Formula for energy in joules is:

                                                        E=VIt

                                                E: energy in joules

                                       V: potential difference in volts

                                              I: current in amperes

                                               t: time in seconds

12. Voltmeter: a device that measures potential different between two points.

13. electrical energy always originates from some other form of energy (chemical, mechanical, thermal, or light energy)