Electric Circuit Theory

Ohm’s law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Which of the following equations represents Ohm's law?

• V = IR

• P = IV

• E = mc^2

• F = ma

How are current and resistance measured?

• Current is measured in volts and resistance in ohms.

• Current is measured in amperes and resistance in ohms.

• Current is measured in ohms and resistance in amperes.

• Current is measured in watts and resistance in volts.

What is the potential difference across a resistance of 1Ω when a current of 1A flows through it?

• 1V

• 2V

• 0.5V

• 10V

Fill in the blank: The potential difference is the _______ drop across a component.

• voltage

• current

• resistance

• power

What is the unit of power?

• Joule

• Watt

• Newton

• Volt

According to Ohm's law, if I = V/R, then power can be expressed as ______.

• V²/R

• V/R²

• R²/V

• V²R

What instrument is most conveniently used for measuring current, voltage, and resistance?

• Voltmeter

• Ammeter

• Multimeter

• Ohmmeter

What is the correct way to connect a multimeter to measure current in a circuit?

• In parallel with the component

• In series with the component

• Across the power supply

• Across the resistor

What is the formula for the total capacitance (CT) when capacitors are connected in series?

• CT = C1 + C2 + C3

• 1/CT = 1/C1 + 1/C2 + 1/C3

• CT = C1 x C2 xC3

The magnetic field surrounding an inductor stores energy as current flows through the field.

• True

• False