A 20 ohm resistor with a current of 0.25 A...

Question 1 / 27070EhGbzOkngncQPnyoKBPX

Question 1 of 27070EhGbzOkngncQPnyoKBPX

A 20 ohm resistor with a current of 0.25 A passing through it will dissipate how many watts?

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Question 1 of 27070

Q

A 20 ohm resistor with a current of 0.25 A passing through it will dissipate how many watts?

🔍 Key Concepts

• Relationship between voltage, current, and resistance (Ohm’s Law: V = I × R) • Formula for electrical power in a DC circuit (P = V × I and related forms) • Unit relationships: ohms (Ω) for resistance, amperes (A) for current, watts (W) for power

💭 Think About

• First, use Ohm’s Law to find the voltage across the resistor using the given resistance and current. • Next, use one of the power formulas that involves current and either voltage or resistance to calculate the power in watts. • Compare your calculated value carefully with the choices, paying attention to decimal places.

✅ Before You Answer

• Be sure you square the correct quantity (current or voltage) depending on which power formula you use. • Confirm that your final units are in watts (W), not volts or amperes. • Double-check your multiplication and placement of the decimal point when comparing to the answer choices.

Question 1 of 27070

Q

A 20 ohm resistor with a current of 0.25 A passing through it will dissipate how many watts?

A

10 watts

B

20 watts

C

0.025 watts

D

1.25 watts

Question 1 / 27070EhGbzOkngncQPnyoKBPX

Question 1 of 27070EhGbzOkngncQPnyoKBPX

A 20 ohm resistor with a current of 0.25 A passing through it will dissipate how many watts?

Back

Question 1 of 27070

Q

A 20 ohm resistor with a current of 0.25 A passing through it will dissipate how many watts?

🔍 Key Concepts

• Relationship between voltage, current, and resistance (Ohm’s Law: V = I × R) • Formula for electrical power in a DC circuit (P = V × I and related forms) • Unit relationships: ohms (Ω) for resistance, amperes (A) for current, watts (W) for power

💭 Think About

• First, use Ohm’s Law to find the voltage across the resistor using the given resistance and current. • Next, use one of the power formulas that involves current and either voltage or resistance to calculate the power in watts. • Compare your calculated value carefully with the choices, paying attention to decimal places.

✅ Before You Answer

• Be sure you square the correct quantity (current or voltage) depending on which power formula you use. • Confirm that your final units are in watts (W), not volts or amperes. • Double-check your multiplication and placement of the decimal point when comparing to the answer choices.