If the voltage source, Es$,$ provides $48\mathrm{.}6$ J at a constant rate to the circuit for $9$ minutes, how much power is being supplied by the source? b$)$ Assume that to match the power rating found in part a$,$ RL needs to be $500.$ How much power is being dissipated by the load if RL$=500?$ c$)$ What is the efficiency of the circuit for the RL value given in part b$?$