What is CQ Thread Ball Valves
2 answers:
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Answer:
Resistance of copper = 1.54 * 10^18 Ohms
Explanation:
<u>Given the following data;</u>
Length of copper, L = 3 kilometers to meters = 3 * 1000 = 3000 m
Resistivity, P = 1.7 * 10^8 Ωm
Diameter = 0.65 millimeters to meters = 0.65/1000 = 0.00065 m
Radius = 0.000325 m
To find the resistance;
Mathematically, resistance is given by the formula;
Where;
- P is the resistivity of the material.
- L is the length of the material.
- A is the cross-sectional area of the material.
First of all, we would find the cross-sectional area of copper.
Area of circle = πr²
Substituting into the equation, we have;
Area = 3.142 * (0.000325)²
Area = 3.142 * 1.05625 × 10^-7
Area = 3.32 × 10^-7 m²
Now, to find the resistance of copper;
<em>Resistance = 1.54 * 10^18 Ohms </em>
Answer:
a) The current in the heating element when it is connected to 120 V is 9.229 amperes, b) The power received by the heatng element connected to 120 V is 1107.522 watts.
Explanation:
a) The resistance as a function of voltage and power can be obtained from this expression, derived from the Ohm's Law:
Where:
- Source voltage, measured in volts.
- Heating element resistance, measured in ohms.
Now, resistance is clear and determined afterwards:
If and
, then:
Now, let consider that heating element is conected to a 120-V source. The power generated by this element is:
Besides, power as a function of current and resistance is given by this:
Where is the current required by the heating element, measured in amperes, and which is cleared herein:
If and
, then:
The current in the heating element when it is connected to 120 V is 9.229 amperes.
b) The power received by the heatng element connected to 120 V is 1107.522 watts. (see point a) for further details)