TEST FC 'Electricity Progress Test' 17/10/2024 Flashcards
The Current Through a Component Increases Steadily from Zero to 200mA over 60ms.
The Amount of Charge that Passed Through the Component is:
6.0x10^-3 C
The Current Through a Component Increases Steadily from Zero to 200mA over 60ms.
The Number of Electrons that have Passed Through the Component is:
3750x10^13
The Value of Resistance per Metre of a Copper Wire, which has Diameter 1.0mm, is:
(ρCu = 1.7x10^-8Ωm)
2.0x10^-2 Ω/m
A Lamp runs off 12V Supply and has a Power Rating of 24W.
The Current Passing Through the Filament during the Lamp’s Normal Operation is:
2.0A
A Lamp runs off 12V Supply and has a Power Rating of 24W.
The Resistance of the Filament during the Lamp’s Normal Operation is:
6.0Ω
Electrical Resistance is: (there might be more than one answer:
A) Always Given by the Reciprocal of the Gradient of the I/V Plot.
B) A Measure of how Slowly Current Flows Through a Component, or Conductor.
C) An Intrinsic Property of a Material.
D) Always Given by R=V/I (Apart from when I= 0A).
E) Determined by the Dimensions of a Conducting Sample.
F) The Rate of Current Flow Per Unit Volume Across a Component.
D & E
A Component is Definitely Ohmic if: (there might be More than One Correct Answer):
-The Component’s Resistance is Constant.
-It is a (well behaved) Resistor.
-The Current Flowing Through the Component is Directly Proportional to the Applied PD.
-It Shows a Linear Relationship Between the Square of the Voltage Across the Component and the Power as it Dissipates.
The Current in a Wire is 20mA.
How Many Electrons Pass a Point in the Wire in 2 Minutes?
1.5x10^-19
A Resistor with Resistance R is Made from Metal Wire of Resistivity ρ. The Length of the Wire is L.
What is the Diameter of the Wire?
2*root(ρL/πR)
A 1.5m Length of Wire has a Cross-Sectional Area 5.0x10^-8 m^2. When the Potential Difference Across its Ends is 0.20V, it Carries a Current of 0.40A.
The Resistivity of the Material from which the Wire is Made is:
1.7x10^-8 Ωm
