BEEE MID1

Which of the following types of materials generally have one or few valence electrons that are free to move and conduct electricity?

• Insulators

• Conductors

• Semiconductors

• Non-metals

Which of the following materials typically has four valence electrons and can act as a semiconductor?

• Copper

• Silicon

• Rubber

• Glass

Which of the following equations represents Ohm's Law?

• P=V×I

• I=R×V

• V=I×R

• V=P×R

In a circuit where the voltage is 12 volts and the resistance is 4 ohms, what is the current flowing through the circuit?

• 3 amperes

• 6 amperes

• 48 amperes

• 16 amperes

If two resistors are connected in series, the total resistance is:

• The sum of the individual resistances

• The product of the individual resistances

• The difference between the individual resistances

• The average of the individual resistances

Resistivity is measured in:

• Ohms

• Ohm-meters (Ω·m)

• Siemens

• Watts

For a given material, increasing temperature generally:

• Decreases resistivity and increases conductivity

• Increases resistivity and decreases conductivity

• Has no effect on resistivity or conductivity

• Increases conductivity but has no effect on resistivity

In most conductors, the relationship between resistance and temperature can be approximated by:

• R=R0×(1+αT)

• R=R0×(1−αT)

• R=R0×(1+αT2)

• R=R0/(1+αT)

The temperature coefficient of resistance (α) is defined as:

• The change in resistance per unit change in temperature

• The resistance at a specific temperature divided by the resistance at another temperature

• The resistance of the material at absolute zero

• The reciprocal of the resistance

The unit of the temperature coefficient of resistance is:

• Ohms

• Ohm-meters (Ω·m)

• Per degree Celsius (°C⁻¹)

• Siemens