Table of Contents
What is the effect on the current in a series circuit when both the voltage and resistance are cut in half?
Voltage is directly proportional to Current. If the voltage is cut in half, the current is cut in half. The bulb connected to the 220V source will have a greater current.
Which formula shows a direct proportionality between power and voltage?
Ohm’s law states that the voltage or potential difference between two points is directly proportional to the current or electricity passing through the resistance, and directly proportional to the resistance of the circuit. The formula for Ohm’s law is V=IR.
Why does voltage cause current?
Because metals have free electrons. So Voltage is the energy required to push these electrons through a closed circuit. So when a voltage or potential is applied then these electrons flow from higher potential to lower potential of applied power. Hence in this way voltage makes current to flow.
What is the symbol of voltage?
What is Ohm’s Law?
| Quantity | Ohm’s Law symbol | Unit of measure (abbreviation) |
|---|---|---|
| Voltage | E | Volt (V) |
| Current | I | Ampere, amp (A) |
| Resistance | R | Ohm (Ω) |
What do the letters mean on electrical wiring labels?
Letters, numbers, and wording on wiring labels tell you important information, such as the wire material, the size of the wire, and the type of insulation used on the conducting wires. Labels are found on both individual insulated wires and on insulated cable containing bundles of wires.
What do the labels on non-metallic cables mean?
Labels on Non-Metallic Cable (Romex) Labels on NM cable indicate the size (gauge) of the individual wires, the wire material, the number of wires contained inside the cable, the maximum voltage rating, and whether there is a ground wire present. The wire size and number of wires are indicated with numbers.
What do the labels on the outer sheathing of NM cable indicate?
The labels on the outer sheathing of NM cable indicate the size (gauge) of the individual conducting wires, the wire material, the number of wires contained inside the cable, the maximum voltage rating, and whether there is a ground wire present.
What do Cu and Al mean in electrical wiring?
The wire material is indicated by “CU” for copper and “AL” for aluminum. Here are some examples of labels on common cable types used in home wiring: 14-2G: Cable contains two insulated wires plus a ground wire; the wires are 14-gauge.