Three identical resistors, each of resistance 4 Ω, are connected in series with a battery. An ammeter in the circuit reads 0.50 A.
(i) Calculate the emf of the battery.
(ii) One of the 4 Ω resistors is replaced by an 8 Ω resistor while the battery remains unchanged. Determine the new current in the circuit.
(iii) Calculate the percentage change in current caused by replacing the resistor.
a. (i) Calculate the emf of the battery when three 4 Ω resistors in series draw a current of 0.50 A.
b. (ii) Determine the new current when one 4 Ω resistor is replaced by an 8 Ω resistor.
c. (iii) Find the percentage change in current resulting from the replacement.