What is the relation between current and resistance?
The relationship between current, voltage and resistance is expressed by Ohm’s Law. This states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit, provided the temperature remains constant.
What is a specific resistance?
Specific resistance is defined as the resistance offered per unit length and unit cross-sectional area when a known amount of voltage is applied.
What is the importance of Ohm’s law?
Ohm’s Law is a formula used to calculate the relationship between voltage, current and resistance in an electrical circuit. To students of electronics, Ohm’s Law (E = IR) is as fundamentally important as Einstein’s Relativity equation (E = mc²) is to physicists.
What is the relationship between current and resistance?
Why does high voltage mean low current?
The primary reason that power is transmitted at high voltages is to increase efficiency. The lower current that accompanies high voltage transmission reduces resistance in the conductors as electricity flows along the cables. This means that thin, light-weight wires can be used in long-distance transmission.
What does resistance do to current?
The relationship between resistance and the area of the cross section of a wire is inversely proportional . When resistance is increased in a circuit , for example by adding more electrical components , the current decreases as a result.
What affects a material’s resistance?
How much resistance a material has depends on several factors: the type of material, its width, its length, and its temperature. Materials such as metals have low resistance to electric current. They are called electric conductors. A wide wire has less resistance than a narrow wire of the same material.
Which of the following affects a material’s resistance?
length – longer wires have greater resistance. thickness – smaller diameter wires have greater resistance. temperature – heating a wire increases its resistance.
What does not change the resistance of a wire?
Answer on Question #45708, Physics, Electromagnetism The only item not listed here is voltage. Voltage value is not affect resistance (if we will not take into account any temperature changes).
Which wire is thickest?
Gauge Thickness chart & Information:
| Gauge -Thickness | Dimension inches thick | Dimension millimeters thick |
|---|---|---|
| 30 | .010 also known as 10 mil as it is 10/1000 inch thick | .25 mm 1/4 mm |
| 36 | .005 also known as 5 mil as it is 5/1000 inch thick | .125 mm 1/8 mm |
| 38 | .004 | .101 mm |
| 45-50 | .0014 .0007 |
What size wire do I use for 200 amp service?
For a 200 amp service, you will need to use a #2/0 AWG for copper conductors, or a #4 AWG for Aluminum or Copper-Clad Aluminum. Electrical work can be a daunting task if you do not know all of the requirements, codes, and permit rules.
What is involved in upgrading to 200 amp service?
The cost to upgrade to a 200-amp panel will be $2,000 to $3,000. The job is going to involve a licensed electrician, the utility company and a local building inspector, because you will need a building permit to have the work done. The electrician will reattach the wiring from the existing circuits to the new box.
Is a 200 amp service enough?
A home larger than 2,000 square feet that has central air-conditioning or electric heat probably needs a 200-amp service.
What size wire goes from meter to panel?
For that you will need #4 copper or #2 aluminum. Cable will be 4-4-4-6 copper or 2-2-2-4 aluminum. Since your panel will not be “as close as possible” to the meter, you will need to install a 100 fused disconnect on the outside of the house, or a meter/panel combo with a 100 amp main breaker.
What size wire do you use for a 100 amp service?
2-gauge
Does the meter base get grounded?
Senior Member. The meter base (in line meter base) will be grounded whether or not a grounding electrode conductor is taken into the actual meter base or not. The grounded conductor of the system will perform this function due to the connection to the grounding electrode system installed at the premises served.
How do you wire a meter to a breaker box?
Step by step Process to run a wire from meter to breaker box:
- Step 1: Gather all the necessary tools.
- Step 2: Turn off the main switch.
- Step 3: Insert the four-conductor cable into the clamp.
- Step 4: Find the ground bus bar.
- Step 5: Find the neutral bus bar.
- Step 6: Insert the hot wire.
- Step 7: Install the circuit breaker.
Can ground and neutral be on same bus bar?
Neutrals and grounds are allowed in the same bus bar, However only one neutral wire is permitted under a screw. No other neutrals or grounds are permitted to be under the screw.
Why do you tie the neutral and ground together?
The reason they’re bonded at the panel is to ensure that we have no current flowing between neutral and ground relative to each other throughout the house. It’s the same reason we bond to the plumbing system, CATV, telephone, etc so there’s no potential between different electrical components.