Current #1
What is the symbol for current in the Ohm's Law equation?
I
What do the letters AC stand for?
Alternating current
What is the symbol used to represent electrical potential difference in a circuit?
V
The current in a DC circuit is _____ proportional to the voltage.
Directly
What is the formula for Ohm's Law?
V = I*R
What is the symbol used to represent the unit of measurement for current?
A
What do the letters DC stand for?
Direct current
What is the name given to the electrical potential difference in a circuit?
Voltage
What object is an example of the creation of current using a chemical reaction?
Cells and batteries
What is the unit of measure for resistance?
ohms
Is this statement true or false? Without voltage, there can be no current.
True
How much current is likely to be running through a light bulb you would use in the laboratory for a practical activity?
2A
What type of electricity is generated when you rub your socks on the synthetic carpet under your desk?
Static
What voltage is delivered to houses in Australia?
240V acceptable but is 230V (216-253 allowable)
230V from 2000 although could read as high as 240 on any given day as it's hard to maintain consistent V across the network.
What is the term for materials with low resistance?
Conductors
The buildup of charge in an insulated object is known as _____ electricity.
Static
Current is really just a flow of ......
Electric Charge or electrons
How many terminals does a voltage source need?
2
Can you use your phone charger overseas?
Not without an adaptor
What is the current through a 10 ohm resistor when it is connected across a 100V supply?
10 Amps
State the units used to measure current AND the analogue equipment you would measure it with (not a digital multimeter)
Amps (amperes)
Ammeter
When current flows through a conductor, why does it generate heat?
Because of resistance
What principle does a generator use to produce electricity?
Magnetic / electromagnetic
A coil of (copper) wire around magnets spinning to create current
What is the voltage carried in large overhead power transmission lines in Australia?
220-500,000 V
Name 3 good conductors of electricity
Copper, silver, gold, aluminum