D) Conditions for passing current
1) complete circuit
2) potential difference (voltage) supplied by some source
ex. Battery, generator
3) conductor (wires)
I. Important Circuit Terms
A) Current (I) - measure of charge flow
I = q/t
= (C)/(sec) UNIT
OR Amperes
q = charge (C)
t = time (sec)
3. If 10. coulombs of charge are transferred through an electric circuit in 5.0 seconds, then the current in the circuit is
I = 10 C/5 sec
I = 2 Amps
1 Coulomb = 6.25 x 1018 electrons
(A bundle of Electrons)
| I = | (#e-)(1.6 x 10-19 C) |
| time |
Ex) A wire carries a current of 2.0 amperes. How many electrons pass a given point in this wire in 1.0 second?
| I = | (#e-)(1.6 x 10-19 C) |
| time |
| 2.0 A = | (#e-)(1.6 x 10-19 C) |
| 1.0 sec |
#e- = 1.3 x 1019
2 sig. figs.