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Dynamic Electricity
Why the bulb can be on?
Electricity exist because of flowing electron
Direction of current
Based on the consensus among scientists
1. Electric current is flowing electron
2. Electric current flows from positive to negative pole (from higher potential to lower
potential)
3. The direction of Electron flow is reversed to the direction of the electric current
What’s electric current?
Electric current (I) is a number of electric charge (q) that is flowing per second (t)
I = q/t
Note:
I = Electric current (A)
q = Electric charge (C)
t = time (s)
PROBLEM
A wire flows 12000 electron per minute, how much electric current is flowing in
this wire ? (you have known that electron charge = 1,6. 10-19 C)
Know : ∑ electron = 12000/minute
Question : I = ….?
Solution :
I = q/t
= 12000 (1,6. 10-19 )/60
= 3.2. 10-17 A
1.
2.
My Charge is 1728 Coulomb.
I Catch a light on and on with flowing
0.02 A of electric current. How many days
will I be empty
A wire that is current flowing 32 A, How many electron is flowing
on this wire during 2 second
What do we need to produce electricity to power a bulb?
1. Electric energy source
2. Cable  path of electron move
3. Closed Circuit
Closed and Open circuit
A.Closed  all parts connected
B.Open  disconnected part
B
A
Ohm’s Law
1. If The voltage (v) is higher, Its current (I) will also be higher, and if it has
lower voltage the current will also be lower.
2. If The Resistance (R) is higher, Its current (I) will be lower and if it has lower
resistance the current will be higher.
Note : R = Resistance (Ω)
V = Voltage (Volt/V
PROBLEM
1.
Using Ohm’s Law, what is the current flowing in 10 Ω Resistor, if the voltage is 5 V
1.
Calculate the current flowing in 6 Ω wire connected to a 12 V accumulator. What is
the current if the wire is connected to 6 V battery?