Understanding Electrical Concepts

What is Ohm's Law?

• Ohm's Law is I = V + R.

• Ohm's Law defines power as P = I / R.

• Ohm's Law states that R = V / I.

• Ohm's Law is V = I * R.

What is the formula for calculating power?

• P = E * t

• P = m * a

• P = F / d

• P = W / t

In a series circuit, the total resistance is:

• The total resistance is the product of all individual resistances.

• The total resistance is the sum of all individual resistances.

• The total resistance is the average of all individual resistances.

• The total resistance is the maximum resistance among all individual resistances.

What does a transformer do?

• A transformer increases the frequency of electrical signals.

• A transformer stores electrical energy for later use.

• A transformer changes the voltage of alternating current.

• A transformer converts direct current to alternating current.

What unit is used to measure electrical resistance?

• ohms

• amps

• watts

• volts

If a circuit has a voltage of 12V and a current of 3A, what is the resistance?

• 8Ω

• 4Ω

• 2Ω

• 6Ω

What is the power consumed by a device that draws 2A at 120V?

• 240W

• 120W

• 60W

• 480W

In a series circuit, how does the voltage across each component relate to the total voltage?

• The total voltage is divided equally among the components.

• The total voltage is the sum of the voltages across each component.

• The total voltage is independent of the components' voltages.

• The voltage across each component is always zero.

What is the primary function of a transformer?

• To increase current levels in a DC circuit.

• To convert AC to DC voltage.

• To change voltage levels in an AC circuit.

• To store electrical energy for later use.

What is the unit of power?

• watt

• joule

• ohm

• volt