Electricity and Circuits

What is the unit of measurement for voltage?

• meters (m)

• watts (W)

• ohms (Ω)

• volts (V)

Explain the relationship between voltage and current in a circuit.

• Current is not affected by voltage in a circuit

• Ohm's law describes the relationship between voltage and current in a circuit.

• Voltage increases as current decreases in a circuit

• Voltage and current have no relationship in a circuit

What is resistance and how is it measured?

• Resistance is the measure of speed of electric current. It is measured in volts (V). It can be measured using a ruler.

• Resistance is the measure of opposition to the flow of electric current. It is measured in ohms (Ω). It can be measured using a multimeter or by using the formula V=IR, where V is the voltage, I is the current, and R is the resistance.

• Resistance is the measure of temperature in an electric circuit. It is measured in degrees Celsius (°C). It can be measured using a stopwatch.

• Resistance is the measure of brightness of electric current. It is measured in lumens (lm). It can be measured using a thermometer.

In a series circuit, how does the total resistance compare to the individual resistances?

• Unrelated to the individual resistances

• Equal to the sum of the individual resistances

• Less than the sum of the individual resistances

• Greater than the sum of the individual resistances

What happens to the total voltage in a series circuit?

• It increases

• It fluctuates

• It decreases

• It remains the same

In a parallel circuit, how does the total resistance compare to the individual resistances?

• Less than the individual resistances

• Equal to the individual resistances

• Greater than the individual resistances

• Unrelated to the individual resistances

Explain how the total voltage is distributed in a parallel circuit.

• The total voltage is distributed equally across all branches.

• The total voltage is distributed in a series circuit, not a parallel circuit

• The total voltage is distributed based on the resistance of each branch

• The total voltage is only distributed to one branch

What is the purpose of a fuse in an electrical circuit?

• To increase the current flow in the circuit

• To protect the circuit from overcurrent and prevent damage to the components.

• To provide lighting in the circuit

• To make the circuit more efficient

How does the brightness of bulbs in a series circuit compare to bulbs in a parallel circuit?

• The brightness of bulbs in a series circuit remains the same, while in a parallel circuit, the brightness increases.

• The brightness of bulbs in a series circuit and a parallel circuit are both the same.

• The brightness of bulbs in a series circuit decreases, while in a parallel circuit, the brightness remains the same.

• The brightness of bulbs in a series circuit increases, while in a parallel circuit, the brightness decreases.

What is the role of a switch in an electrical circuit?

• To play music

• To open or close the circuit

• To cook food

• To send emails