Theory & Safety第 109 / 120 题
Three resistors of 10, 15 and 25 ohms are connected in series across 120 volts. What is the circuit current?
a.24 amperes
b.2.4 amperes
c.4.8 amperes
d.0.42 ampere
解析
Series resistances add: 10 + 15 + 25 = 50 ohms, so I = 120 / 50 = 2.4 amperes. The 24-ampere answer misplaces the decimal, 4.8 amperes would result from a 25-ohm total, and 0.42 ampere inverts the division.
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