21. Four amperes of current are measured through a 24 Ω resistor connected across a voltage source. How much voltage does the source produce?
(a) 960 V
(b) 9.6 V
(c) 96 V
(d) 8 V
22. What is the voltage source for a circuit carrying 2 A of current through a 36 Ω resistor?
(a) 1.8 V
(b) 18 V
(c) 7.2 V
(d) 72 V
23. How much current is produced by a voltage of 18 kV across a 15 kΩ resistance?
(a) 1.2 A
(b) 12 A
(c) 120 mA
(d) 12 mA
24. How much resistance is needed to draw 17.6 mA from a 12 volt source?
(a) 212 Ω
(b) 6.8 kΩ
(c) 68 Ω
(d) 680 Ω
25. Approximately how much current flows through a 3.3 MΩ resistor across a 30 V source?
(a) 9 μA
(b) 90 μA
(c) 900 μA
(d) 9000 μA
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