Electrical Quantities and Ohm's Law
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15 Terms
What is electric current?
The rate of flow of electric charge
What unit is used to measure electric current?
Ampere (AMP or A)
Which symbol represents electric current in electrical equations?
I
What is voltage?
Electrical potential difference between two points
What unit is used to measure voltage?
Volt
What is resistance?
Opposition to the flow of electric current
What unit is used to measure resistance?
Ohm
Which symbol represents the unit of resistance?
Ω
What does electrical power describe?
The rate at which electrical energy is transferred or converted
What unit is used to measure Electrical Power?
Watt
Which equation represents Ohm's Law for finding current?
I = V ÷ R
A circuit has 12 V applied across a resistance of 6 Ω. How much current will flow?
2 A
A resistor has 3 A flowing through it and a resistance of 4 Ω. What is the voltage across the resistor?
12 V
If voltage remains constant and resistance increases, what happens to current?
Current decreases
If resistance remains constant and voltage increases, what happens to current?
Current increases