Task 2 You have been asked to investigate the loading effects on an alternator supplying a load and also charging a car battery at the same time. The output of the alternator has been rectified to smooth dc, and the circuit is shown below. Using Kirchhoff analysis, determine the initial current in each section along with its direction and the potential difference across the load.

Task 4.2- Describe the principles of operation of electrical cells and review the applications in the modern world A) Write down 4 advantages and 4 disadvantages of secondary cells compared to primary cells. B) Write down three different types of fuel cell, for each one include a brief description of the process involved and where it is used

Task 4.1 - Calculate basic electrical parameters in D.C. circuits using electrical circuit theory A) What is the current when a charge of: a) 3.0C passes through a lamp in 20s? b) 3600C passes a point in 3.0 minutes? c) 0.2μC flows through a diode in 2.0ms? B) A charge of 4000μC passes each point in a wire in 50s. Calculate: a) The charge in coulombs b) The current in the wire c) The number of electrons per second passing each point in the wire (Electron charge = 1.6 x 10-1°C) C) a) What is the pd across a wire of resistance 8.00 when there is a current of 1.5A through it? b) What is the resistance of a wire if a p.d of 6.0V drives a current of 0.25A through it? c) A p.d of 3.0V is applied across a 150 resistor, what is the current? D) a) What is the power of a microwave oven that takes a current of 7.5A from a 230V supply? b) A small 48W electric heater is connected to a 12 V supply, calculate the current. c) When it is hot an electric bar fire has a resistance of 500. What is the power rating? E) A lamp has a p.d of 12V across it. Calculate how much electrical energy is transferred when a) A charge of 400C passes through it. b) A current of 2.5A passes through it for 30s. F) A vacuum cleaner has a rating of 460W on the 230V mains, what fuse should be fitted?

Given the 8-bit signed binary number in sign-magnitude form 10110010. Answer the questions by showing your step by step workout. 1. Find the equivalent signed decimal number. 2. Find the equivalent signed binary number in 2's complement form.

3. (20 pts) What are the following sums? (10 pts each) a) 8-14, 2-j5 b) 6 /-40°, -4 /80°

The optical power versus current relationship for a LED is given byP- 0.02 x i. The maximum allowed power is 10 mW. The LED has a de bias corrent and a 1-MHz ac current applied. (a) Sketch the power-current curve(this is the diode's transfer characteristic). (b) ł the peak signal power is 2 m Wand the peak total power is 10 mW,compute the total peak current,the de bias current, the average optical power, and the modulation index (peak signal power)/(average 6-power). (c) Repeat if the modulation index is now 100% (and the peak signal power is no longer 2 mW).i (d) Let the de current be 50 mA and the peak ac current be 75 mA. Plot the output power versus time for two cycles of the ac signal.

3. Whenever possible, the components are labeled from __________to_______and from _____to______on a ladder diagram. a. top b. bottom c. left d. right

Q15: Convert to rectangular representation and plot the point \text { A. } 8.5 \angle 45^{\circ} \text { B. } 10 / 5-53^{\circ} \text { C. } 10 \angle 130^{\circ} \text { D. } 6 \angle C-150^{\circ} \text { E. } 4.0 \angle 90^{\circ}

The Thyrist or shown in the circuit below is triggered on by a gate current of 1.8 mA and a forward break over voltage of 170 V corresponding to this gate current. The applied AC voltage is 240 V (Peak), load resistance Lp is 100 ohms and holding current is zero. Determine: (a) firing angle(b) conduction angle(c) average load power.

6. Consider the cyclotron setup below. We supply external fields: static magnetic field Bo and oscillating electric field Eo. The particle has charge qo, mass mo, and initial vertical velocity vo. Because of the influence of Bo and Eo, the particle's speed and direction will change over time. The particle will spend less time in the E field as it gets faster. Please ignore this effect for this problem.Instead, assume the time is the same for mathematical simplicity. (a) Plot the velocity magnitude and phase through the B and E fields as a function of time t. Label values whenever the particle moves from an E field to a B field. For the phase, you are free to consider modulus, i.e. subtract multiples of 2n, if desired. (Two plots) (b) Suppose we make the magnetic field stronger, say 3Bo. Does the particle complete a B field halfloop any faster than before? (Short answer) (c) Suppose the cyclotron has a maximum radius of rmax. What is the corresponding maximum velocity an electron can reach in this cyclotron? (Short answer)