A light bulb and a resistor are connected in series to a variable power supply.

Question

A light bulb and a resistor are connected in series to a variable power supply. A student first connects a voltmeter and an ammeter to measure the current through and the voltage across the bulb, as shown in the left circuit. The student varies the power supply voltage and records the readings on the meters. The student then places the voltmeter across the resistor as shown in the right circuit above, and repeats the experiment. She plots the data for both circuit elements in a single graph. Suppose the power supply voltage is now set to +3.0 V. For this power supply voltage, the absolute value of the voltage across the bulb is >3V

Explanation / Answer

1)

a) the voltage across the bulb is < 3 V when power supply voltage is 3.0 V

b) current through the bulb is 0.3 A

2)

R = (4.5-1.75)/0.01 = 275 ohm

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.