EDC-Chapter 2 DC Circuits

Which one of the following is a semiconductor?

• Copper.

• Gold.

• Silicon.

• Silver.

Which one of the following materials is a conductor?

• Copper.

• Germanium.

• Mica.

• Plastic.

The current in a closed circuit is actually the

• resistance to an electron flow.

• rate of flow of electrical charge.

• protons being detached from the atoms.

• electrical pressure exerted in the circuit.

The unit for electrical resistance is

• ampere.

• ohm.

• volt.

• watt.

An electric circuit is supplied by a 10 V power source. Calculate the resistance when the current flowing in the circuit is 2A.

• 2 Ω.

• 5 Ω.

• 20 Ω.

• 50 Ω.

Refer to the circuit of Fig 1. Determine the value of current I₄.

• 15 mA.

• 35 mA.

• 55 mA.

• 90 mA.

Calculate the unknown voltage drop V₃ of Fig 2.

• 9V.

• 29 V.

• 45 V.

• 51 V.

Calculate the power handled by a 100 kΩ resistor carrying a 1 mA current.

• 0.1 W.

• 1 W.

• 10 W.

• 100 W.

Ten coulombs of charge flow past a given point in a wire in 2 seconds. How many amperes of current are flowing?

• 2.0 A

• 5.0 A

• 10.0 A

• 20.0 A

Calculate the current flowing through a 220 ohm resistor when the supply voltage is 100 V.

• 0.45 A

• 2.2 A

• 4.5 A

• 22 A