Ohm's law describes the relationship between current, voltage, and resistance in an electrical circuit. It states that current is directly proportional to voltage and inversely proportional to resistance. The law was formulated by German physicist Georg Simon Ohm. Current refers to the flow of electric charge, usually electrons, through a conductor. Voltage is the force that enables the flow of electrons. Resistance opposes the flow of current. Ohm's law can be used to calculate any one of the three variables if the other two are known using the formulas V=IR, I=V/R, and R=V/I.

1. How Current, Voltage, and
Resistance Relate
Prepared by:
Emmanuel Oliver Mallari & Max Pasion

2. Ohm’s Law
Ohm’s Law describes the relation of the three electrical formulas, that
is the current, voltage, and resistance.
The law was named after the
German physicist that
Formulated it. This was
Georg Simon Ohm.

3. Current
Current is electrical charge carrier in a circuit, usually electron or electron-deficient
atoms that continuously moves through conductors and is often referred to in terms
of “flow”. The unit of current is shown in the image below.

4. Voltage
Voltage is the force or the pressure from an electrical circuit/battery that
enables the flow of charged electrons through a conductor. The unit of voltage
is shown in the image below.

5. Resistance
It is an act of instant resisting that opposes the flow of the electric current in a
circuit. The unit of resistance is shown in the image below.

6. How do we solve for current,
voltage, and resistance.

7. If the voltage is unknown, this is the formula that we are
going to use
Formula:
V = I × R
Voltage = Current × Resistance

8. If the current is unknown, this is the formula that we are
going to use
Formula:
I =
Current =
𝑉
𝑅
𝑉𝑜𝑙𝑡𝑎𝑔𝑒
𝑅𝑒𝑠𝑖𝑠𝑡𝑎𝑛𝑐𝑒

9. If the resistance is unknown, this is the formula that we
are going to use
Formula:
R =
Resistance =
𝑉
𝐼
𝑉𝑜𝑙𝑡𝑎𝑔𝑒
𝐶𝑢𝑟𝑟𝑒𝑛𝑡

10. Simple
Circuit
Analysis
using Ohm's
Law

11. In this first example, we'll figure out how much current (I) is in this
circuit from the given values of voltage (V) and resistance(R)
Lamp
R = 4 Ω
I = ???
I = ???
Battery
V = 16 V
4 Amps

12. In the following second example, from the given values of voltage (V)
and current (I), we will determine the amount of resistance (R) is in this
circuit.
Lamp
R = ???
I = 3 Amps
I = 3 Amps
Battery
V = 12 V
4 Ω

13. In the final example, from the given values of current (I) and resistance
(R), we will determine the amount of voltage supplied by a battery
Lamp
R = 9 Ω
I = 4 Amps
I = 4 Amps
Battery
V = ???
V = IR = (4 Amps)(9 Ω) = 36 V

14. We sincerely Thank you all for
listening!!