Four resistors of 20Ω, 40Ω, 60Ω, and 80Ω are connected in series across a DC voltage source. If the current through this circuit is 1 A, what is the voltage applied to this circuit?

Question

Four resistors of 20Ω, 40Ω, 60Ω, and 80Ω are connected in series across a DC voltage source. If the current through this circuit is 1 A, what is the voltage applied to this circuit?

a) 20 V

b) 100 V

c) 60 V

d) 200 V

Answer 1

The equivalent resistor is 20 + 40 + 60 + 80 = 200Ω

V = IR so V = (1)(200) = 200 volts