An electric iron draws a current of 15 A when connected to a 120-V power source. Its resistance is

Question

BlackTom AI · Accepted Answer

Consider the electrical setup described: a device connected to a 120 V source and drawing a current of 15 A. The key relationship here is Ohm's law, which connects voltage, current, and resistance through V = I R.

Option 0.125 ohms: If R were 0.125 ohms, then the current would be I = V / R = 120 V / 0.125 Ω = 960 A, which is far larger than the given 15 A. This option is inconsistent with the reported current and can be discarded.

Option 8 ohms: Applying Ohm's law with V = 120 V and I = 15 A gives R = V / I = 120 / 15 = 8 Ω. This directly matches the mathematical relationship and the stated current, so this is consistent with the data.

Option 16 ohms: If R were 16 Ω, the current would be I = V / R = 120 V / 16 Ω = 7.5 A. Since the actual current is 15 A, this value would imply a larger current than observed, making this option incorrect.

Option 1800 ohms: With a resistance of 1800 Ω, the current would be I = V / R = 120 V / 1800 Ω ≈ 0.0667 A, vastly smaller than the stated 15 A. This option does not fit the given current and is thus invalid.

In summary, the only option that aligns with Ohm's law and the given voltage and current is the one yielding R = 8 Ω. The other values produce currents that conflict with the reported 15 A. The reasoning hinges on consistent application of V = I R across all options.

Win25_PHYS010_10428 EC Quiz Ch.9-10

An electric iron draws a current of 15 A when connected to a 120-V power source. Its resistance is

View Explanation

Log in for full answers

Similar Questions

An electric heater draws a current of 20 A when connected to a 120 V power source. Its resistance is

When a 100 W, 240 V light bulb is operated at 200 V, the current that flows in it is

If a lamp has a resistance of 120 Ω when it operates at a power of 100 W, what current does the lamp carry?

A 20 V potential difference is applied across a 10 Ω resistor and a 30 Ω resistor connected in parallel. The current in the 10 Ω resistor is

What is the relationship between the applied voltage (ΔV), current (I) and resistance (R) of a conductor?

What is the operating resistance of a 50-watt light bulb designed for a 14-volt system?

What is the operating resistance of a 50-watt light bulb designed for a 14-volt system?

The amperage in a circuit of known resistance is dependent on

More Practical Tools for Students Powered by AI Study Helper

Homework AI Solver

Stylized AI Paper Writer

Plagiarism Checker Assistant

Citation AI Academic Writing Tool

In-Class Translation Assistant

AI Note Generator

AI Quiz Answers

Past Exam Questions from University Test Bank

Smart Practice Assistant

Adaptive Practice

Making Your Study Simpler