Definitions:
Alternating current(AC): current that continually changes direction
Ammeter: a current measuring device
Circuit: the path of current
Direct current (DC): current that flows in a single direction from the power supply through conductor to a load and back to the power supply
Electric current: a flow of charge
Electric potential difference(V): the amount of work required per unit to move a positive charge from one point to another in the presence of an electric field
Electric potential energy: Energy stored when static electric charges are held a certain distance apart
Conventional current: the model of positive charge flow
Current: the total amount of charge moving past a point in a conductor, divided by the time taken.
Load: a device that converts electric enrgy to other forms of energy
parallel circuit: a circuit in which loads are connected side by side
voltmeter: an instrument for measuring potential differences in volts
Current:
I= Q/t (I= current in amperes [A]) (Q=charge in coulombs[C]) (t=time taken)
Electric potential difference (voltage):
V=E/Q (E=energy required to increase the e.p of charge
Energy tranfered by charge flow:
E= VIt
1C = 6.24 * 10^18 electrons
1e = 1.60 * 10^-19 C (Charge of one electron = 1/ 6.24 *10^18)
No comments:
Post a Comment