An alternating voltage given byuiAI V = 70 sin 100 nt is connected across a pure resistor of 25 Q. Find %3D (1) the frequency of the source. (ii) the rms current through the resistor.
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- A) A transformer for a transistor radio reduces 120 V ac to 9 V ac (Such a device also contains diodes to change the 9 V ac to de). The secondary contains 30 tums and the radio draws 400 mA. Calculate (a) the number of turns in the primary, (b) the current in the primary.Three resistors with values of 60Ω, 30 Ω, and 20 Ω, respectively,are connected in parallel to a 110V battery. Draw a circuit diagramand find the (a) equivalentresistance of the combinedresistors, (b) current flowingthrough each resistor, (c) voltagedrop across each resistor, and (d)the power dissipated by eachresistor.Three resistors with values 60.0Ω, 30.0 Ω, and 20 Ω respectively, are connected in series to a 110.0 V battery of negligible internalresistance. Draw the circuit diagram and find the (a)equivalent resistance, (b)current flowingthrough each resistor, (c)voltage drop across each resistor, and (d)power dissipated by eachresistor.
- Problem 6: The voltage of a battery will drop a bit from its ideal voltage E when it is connected in a circuit. This effect can be modeled by ascribing 14 an internal resistance r to the battery, so that the voltage across the batteries terminals is reduced, and given by V = E - Ir where I is the current flowing through the battery. Suppose that a 15 Volt battery is connected in series with a 10 2 resistor in a closed-loop circuit, but the battery itself has a comparable internal resis- tance r = 1 N. (a) What is the current in the loop in steady state? (b) What is the voltage drop across the resistor? What is the voltage drop across the battery? (c) At what rate is heat dissipated by the resistor? At what rate is heat dissipated by the battery? (d) If the battery is well insulated, and its heat capacity is 5 J/K, about how many minutes can the circuit be closed before the temperature of the battery rises to 451 degrees F?A 15.5 V battery is connected to a 102 Ωresistor.Neglecting the internal resistance of thebattery, calculate the power dissipated in theresistor.Answer in units of W.Given the circuit diagram belowand assuming that the emf(ε=12V) Find:(a) the total resistance(b) the total current in the circuit(c) the current in each resistor (d) the potential difference acrosseach resistor (e) the power dissipated by eachresistor (f) the power dissipated by theentire circuit
- Question 8. A common transistor radio set requires 12 V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V (A.C.) on standard domestic A.C. supply. The number of turns of the secondary coil are 24, then the number of turns of the primary are ______.Calculate (a) V, (b) Vop, (C) T, and (d) f for the sine wave voltage in the figure. 54 V 0.(A) If the resistor color code has measured values between 7.79 2 and 8.61Q, what is its nominal value and tolerance? And then record resistor color code bands. (B) Using CDR to determine i-line and all i-branches for the circuit in Fig. below: 120 V 6Ω 1Ω 2Ω
- we have a voltage source (battery) connected to a resistor and capacitor in series. Differential equation for voltage of capacitor Vc(t) is attached. C = 0.001, Vin = 9 a) Assume R = 100 ohms, check with direct substitution that Vc(t) = 9*(1 - e^(-10t)), satisfies the ode and initial condition. b) Assuming resistance increases with time; R = R(t) = 100+2t, solve ordinary differential equation for Vc(t), using one of two methods: seperation of variables, or integrating factor method.21 V, L 0, S2 is closed and S1 is opened. Determine (a) the current through L at For the circuit shown below, ɛ Si closed and S2 open, at t t = 0, (b) the current through L at t t = 3 x 10-4 4.5 mH, and R = 4N. After steady state is reached with 3 x 10 s, (c) the voltage across R on the right at s, and (d) the rate at which current through L changes att = 3 x 10-4 s. R E .R Hint a. The current through L at t = 0 is 5.25 A. Additional Hints for (a) .4 b. The current through L at t = 3 x 10 s is 4.0211 A. Additional Hints for (b) - 4 c. The voltage across R att 3 x 10 s is 16.17 V. Additional Hints for (c) d. The rate at which current through L changes at t = 3 × 10° s is A/s. Additional Hints for (d). 0000A capacitor bank is designed to discharge 5.00 J of energy through a 10.0-kΩresistor array in under 2.00 ms. To what potential difference must the bank be charged, and what must the capacitance of the bank be?
