Quiz on Resistance, E.M.F., and Ohm's Law

What is the definition of electrical resistance?

• The ability of a material to conduct electricity
• The opposition to the flow of electric current
• The speed at which electrons move through a wire
• The amount of voltage in a circuit

Which unit is used to measure electrical resistance?

• Volt
• Ampere
• Ohm
• Watt

What does E.M.F. stand for in electrical circuits?

• Electrical Magnetic Force
• Electromotive Force
• Electron Movement Factor
• Energy Measurement Function

What is the relationship between voltage, current, and resistance according to Ohm's law?

• V = I × R
• V = I ÷ R
• R = V × I
• I = V × R

Which factor does NOT affect the resistance of a wire?

• Length
• Cross-sectional area
• Material
• Color

What happens to the current in a circuit if the voltage is doubled and the resistance remains constant?

• It doubles
• It halves
• It remains the same
• It becomes zero

Which material is typically the best conductor of electricity?

• Copper
• Rubber
• Glass
• Plastic

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

• To increase voltage
• To store energy
• To control current flow
• To generate electricity

How does the resistance of a wire change if its length is doubled?

• It doubles
• It halves
• It remains the same
• It becomes zero

What is the SI unit of electromotive force (E.M.F.)?

• Ampere
• Ohm
• Volt
• Watt