WorksheetsUnderstanding Resistances and Thermistors
Total questions: 20
Worksheet time: 10mins
What is the standard unit of electrical resistance in the International System of Units (SI)?
Ampere
Ohm
Volt
Watt
Which device is specifically designed to change its resistance with temperature?
Capacitor
Thermistor
Inductor
Diode
What does VDR stand for in electronics?
Variable Direct Resistor
Voltage Dependent Resistor
Very Dense Resistor
Variable Diode Resistor
Which colour band on a resistor represents the number 2?
Red
Green
Blue
Yellow
What is the main function of a resistor in an electrical circuit?
To store energy
To oppose the flow of current
To amplify signals
To convert AC to DC
Which type of thermistor increases its resistance as temperature decreases?
NTC (Negative Temperature Coefficient)
PTC (Positive Temperature Coefficient)
VDR
LDR
What is the equation for Ohm’s Law?
V=I×R
P=V×I
I=V×R
R=V+I
Which of the following is NOT a type of resistor?
Wire-wound
Carbon film
Electrolytic
Metal oxide
What is the tolerance colour code for a gold band on a resistor?
1%
5%
10%
20%
Which unit is used to measure resistance?
Volt
Ohm
Ampere
Watt
A resistor with the colour bands: brown, black, red, and gold has what resistance value?
1,000 Ω with 5% tolerance
100 Ω with 5% tolerance
10,000 Ω with 5% tolerance
1,000 Ω with 10% tolerance
Which type of resistor is commonly used for high power applications?
Carbon composition
Wire-wound
Metal film
Thin film
What is the main application of a VDR (Voltage Dependent Resistor)?
To measure temperature
To protect circuits from voltage spikes
To store charge
To amplify signals
Which colour band represents the multiplier of 103 on a resistor?
Orange
Red
Green
Blue
What is the resistance of a resistor with the colour bands: green, blue, brown, and silver?
560 Ω with 10% tolerance
56 Ω with 10% tolerance
560 Ω with 5% tolerance
56 Ω with 5% tolerance
Which of the following is a variable resistor?
Potentiometer
Thermistor
VDR
LDR
What is the SI unit symbol for resistance?
V
A
Ω
W
Which type of resistor is most affected by changes in temperature?
Metal film
Wire-wound
Thermistor
Carbon composition
What is the resistance value of a resistor with the colour bands: yellow, violet, orange, and gold?
47,000 Ω with 5% tolerance
4,700 Ω with 5% tolerance
470 Ω with 5% tolerance
470 Ω with 10% tolerance
Which of the following is NOT a standard unit used in Great Britain for measuring resistance?
Ohm
Kilo-ohm
Mega-ohm
Joule
