Lesson 4 Process control loop Basics - Understanding Ohm's Law

In the water hose analogy, what does the outlet valve represent?

• Voltage

• Current

• Resistance

• Power

What does Ohm's Law describe?

• The relationship between resistance, capacitance, and inductance

• The relationship between current, voltage, and resistance

• The relationship between current, power, and energy

• The relationship between power, voltage, and resistance

If the resistance is decreased, what happens to the current?

• It increases

• It becomes zero

• It stays the same

• It decreases

What does the Ohm's Law triangle help to do?

• Measure the resistance directly

• Increase the efficiency of electrical circuits

• Calculate the power in a circuit

• Simplify the calculation of voltage, current, and resistance

How is voltage denoted in engineering?

• I

• R

• V

• O

What unit is used to measure current?

• Ohms

• Volts

• Amps

• Watts

Using Ohm's Law, how do you calculate voltage?

• R * I

• I * R

• R / I

• I / R

What is the correct formula to calculate current using Ohm's Law?

• V / R

• R / V

• I = R / V

• V * R

In the practical example, what was the total resistance considered?

• 48 Ohms

• 250 Ohms

• 250 Amps

• 12 Ohms

What was the calculated current in the circuit with a 12-volt battery and 250-ohm resistor?

• 0.048 Amps

• 48 Amps

• 12 Amps

• 250 Amps