1. At 20.0°C, the carbon resistor in an electric circuit connected to a 5.0 V battery has a resistance of 2.0 x 1020. What is the current in the circuit when the temperature of the carbon rises to 80.0°C? (a = -0.5 x 10-31)
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- 3. The resistance of a uniform copper wire 50.0 meters long and 1.15 mm in diameter is 0.830 ohms at 20° C. What is the resistivity of the copper at this temperature? 4. A 200 m long aluminum wire has the same resistance and cross-sectional area as a carbon wire. What is the length of the carbon wire?1. At 20.0°C, the carbon resistor in an electric circuit connected to a 5.0 V battery has a resistance of 2.0 x 1020. What is the current in the circuit when the temperature of the carbon rises to 80.0°C? (a = -0.5 x 10-31)1. A voltmeter has an internal resistance of 500 kilo-ohm. Determine the voltage drop across the voltmeter when a 10 ampere current passes through it. 2. What is the resistance of copper wire that has a length of 1 kilometer and a diameter of 0.505 mm? 3. An aluminum wire has a resistance of 80 ohms at 30 degree Celsius. Determine its resistance when its temperature is lowered to –10°C.
- 1. A wire 300 m long has a resistance of 1.18 Ω and a cross-sectional area of 14 mm2. Of what material is the wire made? 2. A 50 m long wire with a cross-sectional area of 5.5 mm2 has a resistance of 31 Ω at 0 °C. Calculate the resistivity of the wire at 60 °C if the temperature coefficient of resistance at 0 °C is 0.0003 per °C.1. The variation in electrical resistance with temperature can be used to make precise temperature measurements. Platinum is commonly used since it is relatively free from corrosive effects and has a high melting point. Suppose at 20.0°C the resistance of a platinum resistance thermometer is 164.2 2. When placed in a particular solution, the resistance is 187.4 2. What is the temperature of this solution?2. A 50 m long wire with a cross-sectional area of 5.5 mm2 has a resistance of 31 Ω at 0 °C. Calculate the resistivity of the wire at 60 °C if the temperature coefficient of resistance at 0 °C is 0.0003 per °C.
- 1. The resistivity of gold is 2.44 × 10-8 2. m at room temperature. A gold wire that is 0.9 mm in diameter and 14 cm long carries a current of 940 mA. What is the voltage across the wire?At 20°C, the carbon resistor in an electric circuit connected to a 3.5-V battery has a resistance of 2.1 x 10² . What is the current in the circuit when the temperature of the carbon rises to 79°C? X 10.171At 20°C, the carbon resistor in an electric circuit connected to a 6.0-V battery has a resistance of 2.6 x 102 n. what is the current in the circuit when the temperature of the carbon rises to 73°C?
- 3. What will be the resistance of a copper wire that has a radius of 2 cm and length of 100 cm? The resistivity of the copper wire is 1.7x10^(-8) ohm.meter? a. 400 b. 500 c. 600 d. NONE OF THE CHOICES 4. Calculate the temperature of a wire if its resistance is increase to 200 ohm from 150 ohm at 25 degree Celsius. The temperature coefficient of the wire is 0.0225 per degree Celsius. a. 46.28 b. 26.48 c. 84.26 d. NONE OF THE CHOICES 5. Find the current rating of a defibrillator that can pass electric charge at 200 mA at 0.127 seconds. Calculate also the number of electrons on that particular time. a. 2.57 A and 125 electron b. 5.57 A and 1250 electron c. 7.57 A and 12500 electron d. NONE OF THE CHOICES Please don't write in a paper. I can't understand handwritten well.5. How many free electrons are there in a rectangular block of a conductor whose dimension is 8 m by 4 m by 3 m? The electrons of this conductor have a drift velocity of 4 m/s when a 9.6 A of current is applied thru a cross-sectional area of 0.005 m?. Use electronic charge of 1.6 x 10-19 coulomb per electron. Express your answer in scientific notation whose unit is electrons per cubic meter.3. For carbon; P20°c = 3.5 x 10-50-m and a = -5.0 x 10-4/°C. a) At what temperature does a carbon resistor have a resistance of 995 02, if it has resistance of 1000 at 20°C? Assume negligible thermal expansion/contraction. b) What is the conductivity of carbon at the new temperature? c) How does a negative temperature coefficient of resistivity affect the conductivity of a material?