Capacitor charging process

Capacitor charging process shows the variation of voltage and current in the capacitor over time, when it is connected to a DC voltage source

Series and Parallel Resistor Reduction.

Simplifing a series resistor circuit and / or parallel resistor circuit is simple, it is only necessary to make the necessary simplifications using formulas we already know

Resistors in series and parallel

How to calculate resistor in series. How to calculate resistor in parallel

What is a Voltage?

Potential difference or Voltage is a kind of force that push charges through a conductor. The larger the voltage, the larger the force

Benjamin Franklin’s Fluid Theory

Benjamin Franklin imagined the electricity as a invisible fluid. Franklin assured that if any body had more fluid than usual, it could have a positive charge, but if it had less fluid than normal it had negative charge.

Current divider in parallel resistors

By using the current divider rule, we can find the current in each resistor connected in parallel. The electric current passing through a circuit of two resistors in parallel is divided in two.

What is a Voltage divider?

The Voltage divider is a circuit that allows us to obtain an output voltage less or equal to the input voltage. The output voltage is normally obtained across ground and the resistor connected to it, but it could be across any of the other resistors.

What is a wirewound resistor?

A Wirewound resistor is a resistor made with a conductive wire of a high resistivity. This wire is made of a special alloy and it is wound on a support tube of refractory material such as ceramics, porcelain, etc.

What is Direct Current? – DC

Direct Current (DC), is the result of the flow of electrons (negative charge) in a conductor (most of the time, wires of copper) that goes only in one direction.

What is Electrical Resistivity?

Electrical resistivity [ρ] (rho) is a characteristic of materials and has ohm-meter unit. Resistivity indicates how much the material opposes the flow of electric current.

Capacitor and Direct Current

If a battery is connected to a capacitor, it will allows no direct current (DC) to flow through. If a not charged capacitor is connected across the terminals of a battery, a transient current flows as the capacitor plates charge up.

Capacitor and Direct Current. Current starts from its maximum value and decreases to 0 amps. This current is called “transient current”.

Ohm’s Law explanation

You can establish a relation between the battery voltage, the resistor’s value and the electric current that passes through this resistor. This relation is: I = V/R and it is known as the Ohm’s Law.