RMS Current and Voltage Video Lessons

Concept

# Problem: A toaster oven is rated at 2000 W for operation at 120 V , 60 Hz . Part A Part complete What is the resistance of the oven heater element? Express your answer to two significant figures and include the appropriate units. R = 7.2 Ω Previous Answers Correct Part B Part complete What is the peak current through it? Express your answer to two significant figures and include the appropriate units. I0 = 24 A Previous Answers Correct Part C What is the peak power dissipated by the oven? Express your answer to two significant figures and include the appropriate units.

###### FREE Expert Solution

Power in circuits:

$\overline{){\mathbf{P}}{\mathbf{=}}\frac{{\mathbf{V}}^{\mathbf{2}}}{\mathbf{R}}}$

Peak current:

$\overline{){{\mathbf{i}}}_{\mathbf{m}\mathbf{a}\mathbf{x}}{\mathbf{=}}\frac{{\mathbf{V}}_{\mathbf{m}\mathbf{a}\mathbf{x}}}{\mathbf{R}}}$

Peak power:

$\overline{){{\mathbf{P}}}_{\mathbf{m}\mathbf{a}\mathbf{x}}{\mathbf{=}}{{\mathbf{i}}}_{\mathbf{m}\mathbf{a}\mathbf{x}}{{\mathbf{V}}}_{\mathbf{m}\mathbf{a}\mathbf{x}}}$

Part A

From the equation for power, P = V2/R, we can get R as:

80% (323 ratings)
###### Problem Details

A toaster oven is rated at 2000 W for operation at 120 V , 60 Hz .

Part A Part complete What is the resistance of the oven heater element? Express your answer to two significant figures and include the appropriate units. R = 7.2 Ω Previous Answers Correct

Part B Part complete What is the peak current through it? Express your answer to two significant figures and include the appropriate units. I0 = 24 A Previous Answers Correct

Part C What is the peak power dissipated by the oven? Express your answer to two significant figures and include the appropriate units.