Question

A circuit is supplied with 60 VDC and contains two series resistors with values of 100 and 400 . What is the total current in the circuit?
A. 2 A
B. 0.82 A
C. 1.2 A
D. 0.12 A

What circuit quantity is measured by connecting a meter's test leads in series with an energized component?
A. Resistance
B. Power
C. Voltage
D. Current

Answer 1

When resistors are connected in series, they act like
a single resistor whose resistance is their sum. 

100 ohms and 400 ohms, connected in series, look like
a single resistor of 500 ohms.

           Current = (voltage) / (resistance)

                        = (60 volts) / (500 ohms) = 0.12 A.
________________________

Current is measured by connecting a meter in series
with an energized component.  In other words, a break
is made in the circuit, the meter is connected in the break,
and the current to be measured literally flows through the meter.