EDC Revision _2

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

• 2A

• 5A

• 10A

• 20A

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

• 15 mA

• 35 mA

• 55 mA

• 95 mA

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

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

Three resistors of values 470 Ω, 560 Ω and 820 Ω are connected in series across a 10 V dc supply source. If the 560 Ω resistor is open-circuited, determine the current flowing in the circuit.

• 0 A

• 5.41 A

• 7.75 A

• 9.71 A

Refer to Fig 2. If the voltage drop across R3 is 5 V, determine the value of the supply voltage, Vs

• 5 V

• 10 V

• 15 V

• 20 V

The following parameters are factors affecting the resistance of a conductor except its

• length

• material

• weight

• cross sectional area

Two resistors of values 150 Ω and 300 Ω are connected in parallel across a 20 V dc supply. Determine the total power dissipated in the circuit.

• 0.89 W

• 1.33 W

• 2.67 W

• 4 W

Which one of the following materials is the dielectric of a capacitor?

• Copper

• Glass

• Paper

• Steel

A capacitor has an IEC code of 473J. Determine the value of the capacitor.

• 0.0047 µF ± 5%

• 0.0047 µF ± 10%

• 0.047 µF ± 5%

• 0.047 µF ± 10%