Unit 2 - Electrical

A four-band resistor has the colour code of orange-red-yellow-silver.

What is the resistance of the resistor?

• 320 kΩ

• 128 Ω

• 20 Ω

• 324 kΩ

What will be the effect on the current flow if the total resistance in a circuit decreases?

• The current flow will cease.

• The current flow will increase.

• The current flow will decrease.

• The current flow will remain constant.

Three resistors are connected in series with value of 20, 40, and 800 Ω.  What is the total resistance in the circuit? 

• 860 MΩ

• 0.86 kΩ

• 8.6 kΩ

• 86 Ω

Suppose you have a 1000-ohm resistor connected to a 9-volt battery. It has 0.009 amps flowing through it. What is the power consumed by the resistor.

• 81 W

• 9 W

• 81 mW

• 9 mW

Identify the following symbol.

• cell

• capacitor

• battery

• transformer

A transformer has 1000 turns in the primary winding and 200 turns in the secondary winding. If the voltage applied is 240 volts AC, what is the secondary voltage?

• 240 V

• 1200 V

• 0.02 V

• 48 V

The resistance and tolerance of the resistor in the figure above is

• 105 Ω, 5%

• 105 Ω, 10%

• 1 MΩ, 5%

• 1 MΩ, 10%

The device shown above is best described as

• an open single-pole single-throw switch.

• an open double-pole single-throw switch.

• a closed single-pole double-throw switch.

• a closed double-pole double-throw switch.

The device shown in the diagram above is

• a relay.

• a Zener diode.

• a phototransistor.

• an electrical motor.

The circuit above is a noise-suppression network.

Calculate the value of the capacitance of C3 so that the total capacitance of the circuit is 0.1 μF

• 22 nF

• 78 nF

• 100 nF

• 2 μF