5555555555 12. A 470 Ω resistor, a 220 Ω resistor, and a 100 Ω resistor are all in parallel. The total resistance is approximately ________. (a) 790 Ω (b) 470 Ω (c) 60 Ω (d) 30 Ω
5555555555 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
5555555555 13. When there is 12 mA of current through a 1.2 kΩ resistor, the voltage across the resistor is ________. (a) 14.4 V (b) 1.4 V (c) 100 V (d) 10 V