Font size
WorksheetsUEENEEE103A Chapter 3 revision
Total questions: 28
Worksheet time: 2hrs 20mins
Define the term resistance:
The measure of ability to carry an electric current
The friction between two materials to create electricity
The opposition to the flow of current in an electric circuit.
The flow of electrons from negative to positive.
Which answer below best explains the term conductance?
The amount of energy that can be held in an electrochemical cell.
The relationship between resistance and current in an electric circuit.
The measure of the ability of a conductor to carry an electric current.
All of the above.
What is meant by 'current is proportional to voltage'? Select the relevant responses below:
Current increases when voltage increases
Current decreases when voltage increases
Current decreases when voltage decreases
Current increases when voltage decreases
If the resistance of a circuit is doubled and the voltage remains the same, what happens to the current in the circuit?
The current doubles.
The current remains unchanged.
The current increases by half of its original value.
The current drops to half its original value.
A conductor has a resistance of 2 milliohms. What is its conductance?
(a)
During operation, an electric toaster takes a current of 5 A from a 230 V power outlet. Calculate the resistance of the toaster. Provide the value only (no working required).
(a)
The resistance of a relay coil is 150 Ω. Determine the value of the current taken by the coil when it's connected to 12 V. Express the value with a metric prefix.
(a)
A faulty electrical connection in a circuit has developed a resistance of 0.6 Ω. If the current through the connection is 50 A, calculate the voltage that will be across the connection. Provide the value only (no working required).
(a)
Solve the equation:
2×10−32.4×103= No spaces between digits, use ^to indicate power. eg 10^3
(a)
Solve the equation:
(2.2×103)×(4×10−3)=
(a)
Solve the equation:
2.3×10−646×10−3= No spaces between digits, use ^ to indicate power. eg 10^6
(a)
Write 2 mA in engineering notation. No spaces between digits, use ^ to indicate power eg. 10^6
(a)
Write 6.67 µV in engineering notation. No spaces between digits, use ^ to indicate power eg. 10^6
(a)
Write 4.7 MΩ in engineering notation. No spaces between digits, use ^ to indicate power eg. 10^6
(a)
Convert 820 kΩ to MΩ.
There is a space between the value and the units, write the units in full not the abbreviation.
(a)
Convert 0.087 mA to µA. There is a space between the value and the unit, use the full name for the unit not the abbreviation.
(a)
Convert 692 µA to mV.
Space between the value and units.
(a)
Find the total current of 250 µA + 4.5 mA + 0.05 A. Express the answer in milliamps.
Space between the value and units.
(a)
Convert 0.0012 volts to millivolts.
Space between value and units.
(a)
Convert 0.0000096 amperes to µA.
Space between the value and units, write the name of the unit not the abbreviation.
(a)
Convert 35.6 mA to amperes.
Space between the value and the units.
(a)
How much voltage is developed across a resistor of 56 kΩ that has a current of 120 µA flowing through it.
Space between the value and units.
(a)
A circuit with a resistance of 450 Ω is connected to a voltage supply of 330 kV. Calculate the current flowing in the circuit to the second decimal place.
(a)
The voltage across a resistor increases by an order of magnitude. If the current in the resistor is now 650 milliamps, what was it before the voltage increased?
(a)
How much current flows in a resistor of 1k2Ω that has 10 V across it? Express the answer in milliamps.
(a)
The resistance of a heater element, when cold, equals 20 Ω. When the element warms up, its resistance is 50 Ω. If the heater is connected to 230 V, calculate the current the heater element takes when cold, and again when it's warmed up.
Structure the answer as cold=xx,hot=xx - no spaces between any of the values.
(a)
A conductor carrying a current of 120 A has a resistance of 0.07 Ω. Calculate the voltage developed across the length of the conductor.
(a)
In an electrolysis tank, when 2.5 volts is applied between the anode and cathode, a current of 10 kA passes through between the electrodes via the electrolyte. Calculate the electrical resistance of the electrolyte. Express the resistance value in engineering notation.
No spaces between the values, use ^ to indicate power. eg 10^3.
(a)
