Physics Review 4

How does charge flow in voltage difference?

• Low to high.

• Charge flows randomly in voltage difference.
• Charge flows in both directions simultaneously in voltage difference.
• High to low.

What are insulators?

• Materials that do not conduct electricity well.

• Materials that are highly reactive with other substances.

• Materials that are transparent to light.

• Materials that conduct electricity well.

What is the tendency of an object to oppose the flow of electrons?

• Resistance
• Current
• Impedance
• Conductance

What does Ohm's law relates to?

• Ohm, Ampere, and Watt
• Voltage, current, and resistance
• Resistance, capacitance, and inductance
• Voltage, current, and power

What makes resistance become higher?

• Insulators, small diameter, long wire, high temp.

• Diameter increases, material density decreases, current decreases
• Insulators, bigger diameter, long wire, high temp.

• Length decreases, cross-sectional area increases, resistivity decreases

What does a series circuit contain?

• Components connected in multiple paths
• Components connected in a random order
• Components connected in parallel
• Components connected in a single path

What does a parallel circuit contain?

• Multiple paths

• One path

• One loop
• Series connection

If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that

• friction destroyed electrons in the rod.
• the silk has become negatively charged.
• protons have moved to the rod.
• glass attracts more protons.

Charging by ____ occurs when electrons are transferred from one object to another by direct contact.

• reduction
• induction
• conduction
• friction

As shown in the diagram below, a neutral pith ball suspended on a string is attracted to a positively charged rod.

During contact with the rod, the pith ball

• loses electrons

• gains electrons

• loses protons

• gains protons