Resistivity Example No1 Calculate the total DC resistance of a 100 meter roll of 2.5mm^2 copper wire if the resistivity of copper at 20 degree C is 1.72 x 10^-8 Q meter.
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- Integrated ConceptsA short circuit to the grounded metal case of an appliance occurs as shown in Figure 23.60. The person touching the case is wet and only has a 3.00 kΩresistance to earth/ground. What is the current in the short circuit if the resistance of the earth/ground wire is 0.200 ΩQuestion 3A simple series circuit has two resistors connected to a battery. Each resistor has a resistance of 3 Ω. The battery has a potential difference of 12 V. What is the current in the circuit?A 2 A B 4 A C 6 A D 8 ADetermine:a) total resistanceb) total powerc) current in R4 applying currentdivider formulad) voltage across each resistor
- Challenge #3 What is the resistance in a circuit if a potential difference of 110 V causes a current of 10 A?Assume the resistor you were investigating was a rectangular platemade of copper (Fig. 6); how would you determine its resistivity?5. Originally, a circuit contains four (4) identical resistors in series across a battery. If oneresistor is removed, what happens to the value of total current, total resistance andtotal voltage? Express the new quantities in terms of the original quantities
- Challenge #1 A conductor has a diameter of 3.0 mm. How many meters of this material is needed to have a resistance of 1ohm? The resistivity of the conductor is 1.68 ?10−8 Ω. m(First Problem: A 10-gauge copper wire is 5.0 m long. Across the wire is 120V. What current runs in the wire? Look up the meaning of gauge online if you need to. Use the resistivity of copper.) What is the average value of E-field inside that copper wire while flowing the current in the first problem.Ohm's law states that the electric current flowing through a conducting wire, I is directly proportional to the potential difference across its ends, V, provided its temperature stays unchanged. Draw a labelled circuit diagram to verify this law. Explain the function of each component on the circuit.
- Using Ohm's Law 1. The electromotive force of a cell is 1.5V. When connected to an external load of 3.O ohms, the voltage drops to 1.35V. What is the current and internal resistance of the cell?Determine:a) total resistanceb) total powerc) current in ?4 applying current divider formulad) voltage across each resistor. Three lamps, each with resistance of 0.8 Ω, are connected across a 10-V emf source. L2 and L3 are in parallel, and this combination is in series with L1.Find the total current ifa) L2 opens b) L1 is shorted outFour resistors 11 ohms, 16 ohms, 24 ohms, and 40 ohms are in parallel. How do you determine the equivalent resistence?