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.
ScanSolve AI Answer
Here's the solution to question 47: a) (i) The frequency of the a.c signal: Step 1: Determine the period of the signal from the CRO trace. From the figure, one complete cycle of the waveform spans 4 horizontal divisions. The time base control is set at 10 ms/division. T = number of divisions per cycle × time base setting T = 4 divisions × 10 ms/division T = 40 ms Step 2: Convert the period to seconds. T = 40 × 10^-3 s Step 3: Calculate the frequency using the formula f = (1)/(T). f = (1)/(40 × 10^-3) s f = (1)/(0.04 s) f = 25 Hz The frequency of the a.c signal is 25 Hz. (ii) The peak voltage of the input signal: Step 1: Determine the peak amplitude in divisions from the CRO trace. From the figure, the peak amplitude (from the center line to the peak) is 2 vertical divisions. The y-gain sensitivity is set at 120 V/division. Step 2: Calculate the peak voltage. V_p = number of divisions from center to peak × y-gain sensitivity V_p = 2 divisions × 120 V/division V_p = 240 V The peak voltage of the input signal is 240 V. b) State two advantages of a CRO as a voltmeter. • A CRO has a very high input impedance, meaning it draws negligible current from the circuit under test, thus not affecting the circuit's operation. • It can display the waveform of the voltage, allowing for observation of its shape, period, and peak values, which a conventional voltmeter cannot do.