1. (TCO 1) In a circuit, 3.5 V is across a resistor, resulting in a current of 6
ID: 1717136 • Letter: 1
Question
1. (TCO 1) In a circuit, 3.5 V is across a resistor, resulting in a current of 6.25 mA. What is the resistor value?
Question 2.2. (TCO 2) A 5-V source produces 12 mA of current, how much power is being drawn from the power supply?
Question 3.3. (TCO 2) If R1 is 680 ohms, 1/8 watt resistor, calculate the power dissipated by R1, and evaluate if it is operating within it's safe limits. There is 10 V on one end of R1, and -2 V on the other end.
1. (TCO 1) In a circuit, 3.5 V is across a resistor, resulting in a current of 6.25 mA. What is the resistor value?
R2 15 Vdc ack 4 Vdc OX 7 Vdc V2Explanation / Answer
1) the resistor value = 3.5/6.25 m = 560 ohm
2) power is being drawn from the power supply = 5 * 12m = 60mW
3) power dissipated by R1 = (10- (-2))^2/680 = 0.211 W < 1/8 W. so, it is not operating within it's safe limits
4) current through R2 = 12 m A
voltage across R2 = 15 -(7+4) = 4 V
R2= 4/12m = 333.33 ohm
5) i = 12 / (1+2+1+8)K = 1m A
VR1= 1K*1m= 1V
VR2= 2K*1m= 2V
VR3= 1K*1m= 1V
VR4= 8K*1m= 8V
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