Define electromotive force. A cell of e. m.f. E and internal resistancer was connected in series with two series
external resistors, A (of 8-ohms) and B (of 2-ohms). A high resistance voltmeter
connected across A was found to read Svolts. When another resistor C (of 8 ohms)
was connected parallel to A, and then across A and C. the voltmeter read 6 volts.
Draw the circuit diagrams of the two arrangements.

Calculate the internal resistance of the cell.
Calculate the e. m.f. of the cell.
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Select light for the type of wave, adjust the wavelength so that the light is red, and increase the amplitude of the light to the max. then, select the start button at the source location to begin producing the waves. light is a form of electromagnetic wave, containing oscillating electric and magnetic fields. the wave amplitude detector mentioned above shows how the electric field oscillates in time at the location of the probe. the amplitude of the wave at the location of the probe is equal to the maximum electric field measured. how does the amplitude of the wave depend on the distance from the source?