Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Electrical B
| Question | Answer |
|---|---|
| If the applied voltage stays the same, increasing the resistance of the circuit will cause the current to _____ | decrease |
| The difference of the electrical potential between two wires of a circuit is its_______ | voltage |
| Doubling both the line voltage and the circuit resistance cause the current to _________ | remain the same |
| An incandescent light bulb filament measures 120 ohms when it is hot. When it is cold would the resistance be higher, lower, or the same? | lower |
| If a 200 watt tungsten lamp is compared to a 100 watt tungsten lam of the same voltage rating, will the resistance of the 100 watt lamp be higher, lower, or the same? | higher |
| How much current will be drawn by a 4.8 kilowatt heater in a 120 volt circuit? | 40 amps |
| Two bars of copper are the same length but one is twice as thick as the other. Will the thick bar have less resistance, more resistance, or variable resistance> | less resistance |
| If five lights are connected in a series and the filament on one light burns out, what will happen to the remaining lights? | they will go out |
| If five lights are connected in parallel and the filament on one light burns out, what will happen to the remaining lights? | no change |
| The voltage of a circuit is equal to | amps times impedance |
| When resistance is increased in a circuit, what happens to the current? | it is lessened |
| If four 300 watt lamps are connected in parallel, how much total power will be used by the circuit? | 1200 watts |
| If four 200 watt lamps are connected in parallel and one of the lamps burns out, how much total power will be used by the circuit? | 600 watts |
| If four 120 volt, 100 watt lamps are connected in parallel to a 240 volt circuit, what will happen? | They will burn brighter than they would in a 120 volt circuit |
| Phase differences are expressed in _______________ | Degrees |
| What is the value of voltage or current at any one particular moment in time? | Instantaneous |
| What is the amount of voltage an AC voltmeter reads? | root-mean-square |
| What is another name for the "effective value" of voltage or current? | RMS |
| What is the only property that affects current flow in a DC circuit? | resistance |
| What is the induction of a voltage into a conductor because of an expanding or collapsing magnetic field? | mutual induction |
| What is it called when a capacitor has a potential difference between its plates? | discharged |
| If a capacitor is overcharged, the electrons from the negative plate may be pulled through the dielectric to the positive plate. If this happens, what is the capacitor said to have done? | shorted |
| If current and voltage are in phase what is the power factor? | unity and 100% |
| Is apparent power always equal to or greater than true power? | yes |
| If you want to determine true power of a circuit that contains reactance, you must multiply volts times amps times _____ | power factor |
| In an AC circuit that contains no inductance or capacitance, will multiplying volts times amps give you the true power? | yes |
| What is the apparent power of 20 amp load operating at 120 volts with a power factor of 85% | 2040watts |
| What size transformer is needed to supply a 40kw load that operates at 60% power? | 70KVA |
Created by:
theboltchick