16. calculate the resistance using voltage and current, again using voltage and power, again using current and power, and again using r1, r2,r3, and r4 recording the calculations for run 4 rows 2 60-83

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?