9 - Ohm's Law & Electricity Knowledge - May 24

Which variable is equivalent to electrical potential difference?

• Current (I)

• Resistance (R)

• Voltage (V)

• Power (P)

Which variable describes the flow of electrons through the circuit?

• Voltage (V)

• Resistance (R)

• Power (P)

• Current (I)

Which variable describes the opposition to the flow of electrons?

• Voltage (V)

• Resistance (R)

• Current (I)

• Power (P)

What are the corresponding units of measurement for each measured variable mentioned above?

• Voltage = V (volts); current = A (amps); resistance = Ω (Ohms)

• Voltage = A (amps); current = V (volts); resistance = Ω (Ohms)

• Voltage = Ω (Ohms); current = V (volts); resistance = A (amps)

• Voltage = V (volts); current = Ω (Ohms); resistance = A (amps)

Of what type of material is a balloon made?

• Conductive material - loose hold on electrons

• Insulative material - holds onto electrons tightly

• Metallic material - loose hold on electrons

• Magnetic material - tendency to gain electrons

• Insulative material - loose hold on electrons

What causes electrons to be transferred to the balloon when it is rubbed on another object?

• Gravity

• Magnetism

• Friction

• Heat

What kind of charge imbalance is created in the balloon after rubbing it on another object?

• More positive charges than negative charges

• Equal positive and negative charges

• More negative charges than positive charges

• No charge imbalance

What happens when the negatively charged balloon is brought close to a neutrally charged wall?

• The balloon repels the wall

• The balloon is attracted to the positive charges in the wall

• The balloon becomes positively charged

• The balloon statically discharges upon contact (loses its charge)

• The balloon is attracted to the negative charges in the wall

Like charges ______ each other while opposite charges ______ each other.

• attract, repel

• repel, attract

• neutralize, attract

• ignore, push

Electric current is induced in a conductive wire when there is a constantly changing ______ nearby.

• electric field

• gravitational field

• magnetic field

• thermal field