0
What is the current in a copper wire that has a resistance of 2 ohms and is connected to a 9-volt electrical source?
Wiki User
∙ 11y ago
Current equals Voltage divided by Resistance. 9/2=4.5 amps.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
Why does copper have a low resistance?
Because it is a metal so has lots of free electrons which when connected to a circuit detach from the atoms and move around the circuit. This produces a high current, so resistance will be low as current is high.
From copper and manganin which has higher resistance?
The question is actually wrong, they can both have the same resistance if configured differently, the real question should be which has a higher resistivity which is the electrical resistance found in a standard amount of each material. In this case Manganin has a higher resistivity than copper.
Will the resistance of a copper conductor decrease with an increase in the applied voltage?
If all environmental conditions remain constant then the resistance will not change appreciably with applied voltage, but the current will increase. An increase in current will raise the temperature of the conductor which will increase the resistance somewhat.
Do conductors have high or low current?
Low resistance. Think of Ohm's law. Voltage drop is directly proportional to resistance. The higher the resistance, the higher the voltage drop, and the less voltage that is available for the load. Think of conductor resistance as a resistance in series with the load. Also, higher conductor resistance means more power lost, going to heating the conductors. The "line loss" formula is P=I2R. The greater the resistance, the greater the electrical power being converted into thermal power heating the conductors.
Does copper loose electrical conductivities when heated?
no it does not, because it conducts heat and electricityAnswerThe word you are looking for is 'lose', not 'loose'! And the answer is yes. The resistivity of copper increases with temperature, so raising its temperature will cause its resistance to rise or, if you prefer, its conductivity to fall.
What is the current in a copper wire that has a resistance of 3 ohms and is connected to a 9-volt electrical source?
3 amperes. Ohm's law: Voltage is ohms times amperes.
What is the path that an electrical current travels?
electric current
How electrical resistance can be measured in copper and aluminium?
Same as for any other substance: Apply a voltage and measure the current flow. (Resistance equals voltage divided by the current flow.)
What is the current in a copper wire that has a resistance of 4 ohms and is connected to a 9-volt electrical source?
I = E/R = 9/4 = 2.25 AmpereThe wire is dissipating 20.25 watts, and is getting pretty hot.
Why does copper have a low resistance?
Because it is a metal so has lots of free electrons which when connected to a circuit detach from the atoms and move around the circuit. This produces a high current, so resistance will be low as current is high.
Does copper need a voltage to produce a current?
Copper can not of itself produce a current. <><><><><> However, resistance, be it copper or some other material, will produce a current if a voltage is applied to it. The rule is Ohm's law: Current = Voltage divided by resistance.
Characteristics of copper?
Corrosion resistance and electrical conductivity. and its metal
How many nano ohms transferred per meter in copper?
Gold has an electrical resistance of 22.14 nano ohms per meter (nΩ·m), while copper has an electrical resistance of 17.2 nΩ/m and silver has an electrical resistance of 15.87 nΩ/m.
What is specific-resistance?
Electrical resistivity is a measure of how a material opposes the flow of electric current. Copper is used for electrical lines because it has a low resistance relative to its cost. Gold and silver also have a low resistance, but imagine how expensive the power cord for your computer would be if it were made of gold!
Do copper carry current?
Yes, copper is a good electrical conductor.
What are some examples of items with low conductivity?
Thermal resistance: diamond Electrical resistance: copper Optical resistance: quartz
Why is copper used for electrical wiring instead of iron?
Copper wires conduct electricity much better than iron. This is because electric current passes through copper with very less resistance. it is also more ductile and malleable.
