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GENERAL
J BASIC ELECTRICITY
| Question | Answer |
|---|---|
| One kilowatt is equal to how many watts? | - 1,000 watts. |
| What law describes the most fundamental or basic relationships in an electrical circuit? | - Ohm's law. |
| What are the three elements of Ohm's law | Voltage, current and resistance. ( |
| How would you write Ohm's law as an equation? | - E =Ix R, R = E / I, 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 three 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 one of three forms or types. What are they? | Series, parallel and complex (or series-parallel). |
| A 24-volt lead-acid battery has how many cells? | Twelve. |
| A fully charged lead-acid battery has a specific gravity that varies between what two 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 temperature is outside of what two values? | Whenever the temperature is less than 70°F or more than 90°F |
| What is the reason for having separate facilities for storing and servicing nickel-cadmium and lead-acid batteries? | The electrolyte in the two 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 cannot 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 three causes of opposition to current flow in an AC circuit | - Resistance, inductive reactance and capacitive reactance. |
| Define inductance. | - An induced voltage which is opposite in direction to the applied voltage. |
| What component creates capacitance in AC circuits? | A capacitor |
| , How does a capacitor store electricity? | The energy is stored in the form of an electrostatic charge or field that exists between two conductors separated by an insulator.in parallel to each other |
| What property of an AC circuit is defined by the term "impedance"? | The total opposition to current flow. ( |
| What are two reasons that might cause a nickel-cadmium battery to fail to deliver its rated capacity? | Faulty cells or cell imbalance |
| What electrical values are measured by a typical multimeter? | Voltage, current and resistance. |
Created by:
S_A_J