Electricity and Circuits

What is an electric circuit?

• A type of light bulb

• A type of battery

• A path that allows electricity to flow

• A type of magnet

Explain the difference between open and closed circuits.

• An open circuit only works with batteries, while a closed circuit works with both batteries and generators.

• An open circuit allows the flow of electric current, while a closed circuit does not.

• An open circuit is used for high voltage applications, while a closed circuit is used for low voltage applications.

• An open circuit does not allow the flow of electric current, while a closed circuit does.

State Ohm's law and its mathematical formula.

• V = R / I

• V = I + R

• V = I * R

• V = I ^ R

If the voltage in a circuit is 12V and the resistance is 4 ohms, what is the current flowing through the circuit?

• 6A

• 3A

• 10A

• 2A

Define electrical resistance and its unit of measurement.

• ohms (Ω)

• watts (W)

• amps (A)

• volts (V)

What is the difference between series and parallel circuits?

• The difference is that in a series circuit, the current has only one path to flow through all the components, while in a parallel circuit, the current has multiple paths to flow through different branches of the circuit.

• The difference is that in a series circuit, the resistance adds up, while in a parallel circuit, the resistance remains the same.

• In a series circuit, the voltage is the same across each component, while in a parallel circuit, the voltage is different across each branch.

• The difference is that in a series circuit, the current has multiple paths to flow through different branches of the circuit, while in a parallel circuit, the current has only one path to flow through all the components.

Calculate the total resistance in a series circuit with resistors of 3 ohms, 5 ohms, and 2 ohms.

• 15 ohms

• 8 ohms

• 10 ohms

• 20 ohms

Calculate the total resistance in a parallel circuit with resistors of 6 ohms, 4 ohms, and 8 ohms.

• 12 ohms

• 5 ohms

• 2.4 ohms

• 10 ohms

Explain the concept of electric power.

• Speed of electrical current

• Amount of electrical resistance

• Rate of transfer of electrical energy

• Voltage of electrical circuit

Calculate the power consumed by a device with a resistance of 10 ohms and a current of 2A.

• 15W

• 20W

• 30W

• 40W