1. Calculate the p.d. developed across a 750 Ω resistor when the current flowing through it is
(a) 3 A,
(b) 25 mA.
2. An emf of 50 V is applied in turn to the following resistors:
(a) 22 Ω,
(b) 820 Ω,
(c)2.7 M Ω,
(d) 330 k Ω.
Calculate the current flow in each case.