Circuits Flashcards
What is the name of this component?
Variable resistor
How many pencils are there?
What unit is resistance measured in?
Resistance is measured in ohms.
What is the name of this component?
Lamp
What unit is voltage measured in?
Voltage is measured in volts (V).
Describe how to use an ammeter to measure the current in a component.
An ammeter must be connected in series with a component.
What does the prefix k stand for?
k stands for kilo
kilo = x 103
Which quantity is represented by the symbol I?
I = current
Why does an L.E.D. always have a resistor connected in series with it?
An L.E.D. always has a resistor connected in series with it to protect the L.E.D.
The resistor will limit the current in the L.E.D.
Which quantity is represented by the symbol R?
R = resistance
What is the name of this component?
L.E.D. (light-emitting diode)
Which quantity is represented by the symbol V, in the equation shown ?
voltage
(or potential difference)
Round off this number to 3 significant figures.
1,526.33
1,526.33 rounded off to 3 significant figures is
1,530
(the ‘2’ has been rounded up to 3)
Round off this number to 3 significant figures.
3.14159
3.14159 rounded off to 3 significant figures is
3.14
What unit is current measured in?
Current is measured in amperes (A).
What is the name of this component?
L.D.R. (light-dependent resistor)
What is the name of this component?
Cell
Name as many different types of energy as possible.
Kinetic, potential, electrical, chemical, light, heat, sound, nuclear
How could the resistance of a component be found from this graph?
The resistance could be found by
(a) calculating the gradient of the graph
(b) choosing a point on the graph and calculating voltage / current
What does the prefix m stand for?
m stands for milli
milli = x 10-3
What is the definition of current?
Current is how much electrical charge flows (past a point) in one second.
What does a.c. stand for, and what does it mean?
a.c. stands for alternating current, which means the current changes direction every fraction of a second.
How many types of electric charge are there, and what are their names?
There are two types of electric charge - positive and negative
Describe how to use a voltmeter to measure the voltage across a component.
A voltmeter must be connected in parallel with a component.
What is the name of this component?
Resistor
