The formula for determining the power in a...

Question 1 / 27070gcrrq0XdWDnRUr3WHFaB

Question 1 of 27070gcrrq0XdWDnRUr3WHFaB

The formula for determining the power in a DC circuit when the voltage and resistance are known is:

Back

Question 1 of 27070

Q

The formula for determining the power in a DC circuit when the voltage and resistance are known is:

🔍 Key Concepts

• Ohm's Law relationships between voltage (E), current (I), and resistance (R) • The basic power formula in electrical circuits • How to substitute using E = IR to get power in terms of voltage and resistance

💭 Think About

• Start from the common power equation that involves voltage and current, then think about how to express current using Ohm's Law. • Ask yourself: if E = IR, how can I rewrite current (I) in terms of E and R, and then plug that into the power formula? • Compare the dimensions: if power is in watts, what kind of combination of voltage and resistance (or current and resistance) gives you watts?

✅ Before You Answer

• Be sure you know that E stands for voltage, I for current, R for resistance, and P for power. • Confirm you are using DC circuit formulas (not AC power factor formulas). • Double-check whether the resistance should be in the numerator or denominator when power is expressed using only voltage and resistance.

Question 1 of 27070

Q

The formula for determining the power in a DC circuit when the voltage and resistance are known is:

A

P = ( E squared) R

B

P = EI

C

P = ( I squared) R

D

PF = W/IE

Question 1 / 27070gcrrq0XdWDnRUr3WHFaB

Question 1 of 27070gcrrq0XdWDnRUr3WHFaB

The formula for determining the power in a DC circuit when the voltage and resistance are known is:

Back

Question 1 of 27070

Q

The formula for determining the power in a DC circuit when the voltage and resistance are known is:

🔍 Key Concepts

• Ohm's Law relationships between voltage (E), current (I), and resistance (R) • The basic power formula in electrical circuits • How to substitute using E = IR to get power in terms of voltage and resistance

💭 Think About

• Start from the common power equation that involves voltage and current, then think about how to express current using Ohm's Law. • Ask yourself: if E = IR, how can I rewrite current (I) in terms of E and R, and then plug that into the power formula? • Compare the dimensions: if power is in watts, what kind of combination of voltage and resistance (or current and resistance) gives you watts?

✅ Before You Answer

• Be sure you know that E stands for voltage, I for current, R for resistance, and P for power. • Confirm you are using DC circuit formulas (not AC power factor formulas). • Double-check whether the resistance should be in the numerator or denominator when power is expressed using only voltage and resistance.