The net resistance of the bulb : 16 Ω
Electric current (symbolized by the letter "i) is the amount of charge flowing in the conductor of each unit of time
Can be formulated:
[tex]\large{\boxed{\bold{I=\frac{Q}{t}}}[/tex]
Q = charge (Coulomb)
t = time (seconds)
The international standard unit of electric current is Coulomb/second or Ampere (A).
Electric current is also a ratio between the voltage and the amount of resistance at the conductor.
Can be formulated
[tex]\large{\boxed{\bold{I=\frac{V}{R}}}[/tex]
V = Voltage (volts)
R = resistance (ohms)
This formula is also known as Ohm's Law
A small light bulb is connected to a 20 V battery and draws 1.25 A of current, so,
[tex]\tt V=20~V\\\\I=2.5~A[/tex]
the resistance :
[tex]\tt R=\dfrac{V}{I}\\\\R=\dfrac{20}{1.25}\\\\R=16~ohm[/tex]
