This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
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Here are the solutions to the questions: Summative assessment 1. Choose the correct words from the box below to complete the sentences. a) The basic transformer consists of two coils electrically insulated from each other. b) When the secondary voltage is greater than the primary voltage, the transformer is called a step-up transformer. c) When the secondary voltage is less than the primary voltage, the transformer is called a step-down transformer. d) The purpose of laminating the core is to reduce loss due to eddy currents. e) Small transformers are cooled by air convection. 2. A single-phase transformer with a voltage of 11 kV on the primary coil draws a current of 2 A from the supply. If the turns ratio is 20 : 1 and there are 110 turns on the secondary side, calculate: Given: Primary voltage, V_P = 11 kV = 11000 V Primary current, I_P = 2 A Turns ratio, (N_P)/(N_S) = (20)/(1) Secondary turns, N_S = 110 turns a) the current flowing through the secondary coil Step 1: Use the transformer turns ratio and current relationship. (N_P)/(N_S) = (I_S)/(I_P) Step 2: Substitute the given values. (20)/(1) = (I_S)/(2 A) Step 3: Solve for I_S. I_S = 20 × 2 A I_S = 40 A b) the number of turns on the primary coil. Step 1: Use the transformer turns ratio. (N_P)/(N_S) = (20)/(1) Step 2: Substitute the given secondary turns. (N_P)/(110) = (20)/(1) Step 3: Solve for N_P. N_P = 20 × 110 N_P = 2200 turns Assignment 2 - Question 1 Complete the following statements: a) To obtain more current capacity, cells are connected in parallel. b) A chemical cell is one which converts chemical energy into electrical energy. c) Transformers have no moving parts. d) When two resistors are connected in parallel, the voltage across each resistor is the same. e) In a parallel circuit, an open circuit in one branch results in no current through that branch, but the other branches will still draw their normal current. f) If two bulbs connected in parallel dissipates 100 W, then the total power supply voltage source is equal to (cannot be determined from the given information). g) One of the advantages of load balancing is that each phase conductor carries the same current. h) In a series circuit the total resistance is greater than any of the resistors. 3 done, 2 left today. You're making progress.