OHM'S LAW
What law explains the relationship among voltage, current, and resistance?
Ohm's Law
What device is used to measure electric current?
Ammeter
What do you call two or more cells connected together?
Battery
What is the formula for Ohm's Law?
V = IR
What device is used to measure voltage?
Voltmeter
When cells are connected in series, what happens to their total voltage?
The voltages are added.
If voltage increases while resistance stays the same, what happens to the current?
The current increases.
What device is used to measure resistance?
Ohmmeter
What happens to the total emf when cells are connected in series?
The emf of the individual cells is added together.
What are the three quantities related by Ohm's Law?
Current, voltage, and resistance.
How should an ammeter be connected to a circuit to measure current?
In series
What is one advantage of connecting cells in series?
It provides a higher output voltage.
Why is Ohm's Law useful when analyzing an electric circuit?
Because it helps determine the relationship among current, voltage, and resistance in a circuit.
How should a voltmeter be connected to a resistor to measure the voltage across it?
In parallel
Why are cells connected in parallel when a higher current or longer battery life is desired?
Parallel cells can provide higher current, and cells connected in parallel tend to have a longer lifespan.