Voltage Explained

What is the primary role of voltage in an electrical circuit?

• To generate heat within the circuit

• To push free electrons around a circuit

• To store electrical energy

• To resist the flow of electrons

In the water analogy used to explain voltage, what does the pressure in the pipe represent?

• The amount of current flowing

• The resistance of the pipe

• The voltage

• The size of the water tank

What does the term "potential difference" signify in an electrical circuit?

• The actual amount of work being performed by the circuit

• The difference in current between two points

• The amount of energy stored in the circuit

• How much work can potentially be done by a circuit

What unit is used to measure potential difference or voltage, and what symbol represents it?

• Amperes (A)

• Ohms (Ω)

• Volts (V)

• Watts (W)

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In a series circuit with two identical lamps powered by a 1.5V battery, what is the voltage measured across each individual lamp?

• 1.5 V

• 3.0 V

• 0.75 V

• 0.375 V

What is a Volt defined as?

• The amount of current flowing through a circuit.

• The resistance offered by a material to electron flow.

• The force required to drive one Coulomb through a resistor of one ohm in one second.

• The rate at which electrical energy is consumed.

How do Direct Voltage (DC) and Alternating Voltage (AC) differ in terms of electron flow?

• DC voltage causes electrons to flow in one constant direction, while AC voltage causes electrons to alternate flowing forwards and backwards.

• DC voltage causes electrons to alternate flowing forwards and backwards, while AC voltage causes electrons to flow in one constant direction.

• Both DC and AC voltages cause electrons to flow in one constant direction, but at different speeds.

• Both DC and AC voltages cause electrons to alternate flowing forwards and backwards, but with different frequencies.

What happens if a hair dryer rated for 110V (US standard) is plugged into a 220V (European standard) wall socket without a voltage converter?

• The hair dryer will operate normally, but at half its usual power.

• The hair dryer will not turn on at all.

• The hair dryer will burn out due to excessive voltage.

• The hair dryer will operate at a higher speed and produce more heat.