Overall Review

Identify the conductor below.

• cloth rag
• plastic bottle
• gold ring

As the resistance in a circuit increases, the electric current __________.

• increases
• decreases
• stays the same

Electricity is the flow of _________.

• protons
• neutrons
• electrons

is the opposition to the flow of charges in a material.

• Resistance

• Voltage

• Time

• Current

What would happen if in a circuit the voltage is increase?

• The time would increase

• The current would increase

• The current would decrease

• The current would stay the same

What would happen if in a circuit, the resistance increases but the voltage stays the same?

• The current would decrease

• The current would increase

• The voltage would decrease

• The voltage would increase

Which factor does not affect resistivity?

• Length

• Mass

• Cross-sectional area

• Temperature

The unit of resistivity is

• Ω/m

• Ω/m²

• Ω.m

• Ω.m²

The nichrome wire has a cross-sectional area of 1.3 × 10^–7 m² . Resistivity of nichrome = 1.1 × 10^–6Ωm and a resistance of 53Ω. The length of the wire is

• 0.63m

• 63m

• 0.0063m

• 6.3m

A copper wire of length 2.5 m and cross-sectional area 2.4 × 10^-7 m² has a resistivity of 1.7x10^-8Ωm. What is the resistance of the wire?

• 1.6x10^-15Ω

• 1.0x10^-14Ω

• 0.18Ω

• 5.6Ω