3 Basic Electricity Flashcards
- One kilowatt is equal to how many watts?
1000
- What law describes the most fundamental or basic relationships in an electrical circuit?
Ohm’s Law.
- What are the 3 elements of Ohm’s Law?
Voltage, current, and resistance.
- How would you write Ohm’s Law as an equation?
E=IR, R=E/R, I=E/R
- If the resistance in a DC circuit remains the same but the voltage doubles, what happens to the amount of current flowing in the circuit?
It also doubles.
- In DC circuits, what unit measures power?
Watts
- What 3 elements are required to form an electrical circuit?
A source of electrical energy, a load or resistance to use the electricity, and wires or conductors to connect the source to the load.
- DC circuits can take 1 of 3 forms or types, what are they?
Series, parallel, complex
- A 24V lead acid battery has how many cells?
12
- A fully charged lead acid battery has a specific gravity that varies between what 2 values?
1.275 and 1.300
- You must apply a correction to the specific gravity reading of the electrolyte of a lead acid battery when the temp is outside of what 2 values?
Below 70 degrees or above 90 degrees.
- What is the reason for having separate facilities for storing and servicing nickel cadmium and lead acid batteries?
The electrolyte in the 2 types of batteries is chemically opposite and the fumes from one type can contaminate the electrolyte of the other type.
- The state of charge of a nickel cadmium battery can’t be determined by measuring the specific gravity of the electrolyte for what reason?
There is no significant change in the specific gravity of the electrolyte as the battery is charged or discharged.
- What is the principal advantage of AC current over DC current?
Power can be transmitted over long distances more efficiently and with smaller wires because the voltage can be easily increased or decreased by a transformer.
- What are the 3 causes of opposition to current flow in an AC circuit?
Resistance, inductive reactance, and capacitive reactance.