WorksheetsUnit 2 - Electrical
Total questions: 12
Worksheet time: 6mins
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
In the circuit below, the specifications for a light-emitting diode, LED, state that, for continuous operation, a voltage drop of 2.7 V and a current of 20 mA are required.
The smallest value of the resistance of R that would satisfy these conditions is
115 Ω
135 Ω
250 Ω
270 Ω
Which one of the following is a suitable application for a mercury switch?
an automatic fertiliser system that provides nutrients
a detection of liquid mercury leaks in laboratory settings
a magnetic detection of a model train, to avoid collisions
an alarm to indicate that a ramp is too steep for a wheelchair
