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- The LED requires a minimum current of 20.0 mA to light. Assuming that your battery is operating at 9.00 V, what would the resistance be if the LED just begins to light up when brought into contact with the end of your carbon resistor? [Answer in kΩ]What resistance values can be createdby combining a 1 kΩ resistor and a 10 kΩ resistor?A wire has a diamter of D=0.65 cm and is L=6.5 m long. When connected to a V=14 V source the wire passes a I=55 A current. a. what is the wire's resistivity in Ω*m?
- A wire has a diameter of D = 0.95 cm and is L = 5.5 m long. When connected to a V = 24 V source the wire passes a I = 35 A current. What is the wire's resistivity in Ω⋅m?Silver has a resistivity of 1.59x10-8 at 20 oC. What is its temperature coefficient of resistance at 30 oCA potential difference of 12 V is found to produce a currentof 0.40 A in a 3.2 - m length of wire with a uniform radius of0.40 cm. What is (a) the resistance of the wire? (b) The resistivityof the wire?
- A current I =0.35 A flows through a cylindrical resistor made out of some unknown ceramic-like composite. The radius of the cylindrical body is 4.25 mm while the length is 1.65 cm. If the potential drop over the resistor is 7.54 V, what is the resistivity of the unknown ceramic material? (Answer in Ohm*m)Silicon is a semiconducting metal with a resistivity of 640 Ω · m. (a) Determine the current per unit area through a 5.02 V silicon junction with a length of 1.64 mm. (Enter your answer in A/m2.) (b) Find the current (in A) through the junction if its cross-sectional area is 3.00 ✕ 10−5 m2.In the circuit, the potential difference VA = VB = 31.0 V and the resistance R1=R2=R3=R4=235 Ohms. Determine the current for Ia and Ib
- Given n resistors each of resistance R, how will you combine them to get the (i) maximum (ii) minimum effective resistance? What is the ratio of the maximum to minimum resistance?When a R = 90.9 Ω resistor is connected across a 12 V battery, a current of 123.9 mA flows. What is the internal resistance of the battery and Terminal voltage of the battery ? (a) internal resistance of the battery(in Ω ) = (b) Terminal voltage of the battery in V =An engineer built the circuit depicted in the figure. Assuming = 8.40 V and R = 4.90 Ω. What is the magnitud (mA) of the current in the 2.00 Ω resistor and what is the potential difference (in V) between points a and b (Vb − Va)?
