Understand why in the circuit voltage drops is the basis for the diagnosis of electrical problems. The polarity of the voltage will affect the components such as resistors, capacitors and inductors, because it determines the direction of the current through the circuit. Following a brief introduction to what happens when a drop in pressure in the circuit.

Voltage and current

The ends of the batteries convert chemical energy into electricity, resulting in a potential difference, also known as the voltage. When this energy through the components such as resistors, capacitors and inductors, known as current. The resistor is designed to resistance to current flow. Capacitors to store energy for electric field, and inductance energy storage as magnetic field.

Voltage reflects the mobile charge the effort required in the circuits. The joule per unit per unit charge, this is the required to produce continuous electron flow. For example, a 9 volt battery charge once per coulomb can do 9 joule's work.

Batteries perform the work, the work is allocated between each component in the system. Although the batteries to provide energy for the mobile charge, component consumes energy. This change will cause the voltage drop. The greater the resistance in the circuit, need more power or voltage to mobile charge with current flow.

Voltage polarity down

The polarity shows how current in the circuit flow from anode to cathode. When the current flow from anode to cathode, electrons flow from cathode to anode.

No matter charge to leave into components or negative charge, resistor consumes energy. Voltage is usually on all passive components (e.g., resistor).

Capacitor and inductor can store energy and used to load or source. The consumption of energy, load and source to produce energy. When the element is used as the load, it has the same as the resistor voltage polarity. In the condenser, the polarity of the voltage drop will not change as discharge. Though as an energy source, the capacitor will produce with the charging current in the opposite direction.

Inductor in trying to maintain the current flow of energy consumption at the same time, leading to change polarity. In essence, inductors will produce the same as the charging current direction of current.

The circuit of the main causes of the frequent pressure drop in is often associated with resistance or load increases. Excessive voltage drop will lead to load a smaller force to work harder, leading to flashing lights or equipment overheating.