Six parallel resistors include two minimum-value resistors of 1.2 kΩ each. What can be said about the total resistance______________?
Show answer Hide answer
Answer: D. is less than 600 Ω
Explanation
The total equivalent resistance of any parallel resistor network is always less than its smallest branch. The smallest individual resistor in this parallel network is valued at one point two kilo ohms. Adding more parallel resistors further decreases the total equivalent resistance below six hundred ohms. Parallel resistance formulas result in an equivalent resistance smaller than any individual resistor. Two identical parallel resistors divide the individual resistance value exactly in half. Parallel connections provide additional current paths, thereby reducing overall circuit resistance.
Circuit designers use parallel resistors to achieve custom resistance values not available commercially. Understanding parallel resistance helps prevent overloading power supplies with excessively low loads. Electrical wiring utilizes parallel concepts to calculate combined conductor resistance in power grids. Option A states the total is less than six kilo ohms which is true but insufficiently precise. Option B incorrectly claims the total resistance is greater than the smallest individual branch. Option C is correct that it is less than one point two kilo ohms, but option D is more specific.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. What is the usual overload capacity limit for diesel engines_______________?
Show answer Hide answer
Answer: A. 2 percent
Standard industrial rating practices define nominal continuous overload capacity limits for specific diesel engines. Diesel engine manufacturers specify a conservative two percent continuous overload margin for standard...
Q2. An abrupt rise in total current drawn by a parallel circuit often signifies______________?
Show answer Hide answer
Answer: C. an increase in source voltage
An abrupt rise in total current drawn from a parallel circuit indicates an increase in source voltage. Assuming constant branch loads, Ohm law dictates that higher voltage forces more current through resistors. Source vo...
Q3. A junction receives 4 A and 3 A of current along two incoming paths. What is the total outgoing current_____________?
Show answer Hide answer
Answer: B. 7 A
Kirchhoff current law states that the total current entering a junction equals total outgoing current. Adding the incoming four amps and three amps together yields a total sum of seven amps. Conservation of charge requir...
Q4. Four 8 Ω speakers in parallel connect to an audio amplifier supplying 12 V maximum. What power must the amplifier deliver_____________?
Show answer Hide answer
Answer: D. 72 W
Four eight ohm speakers connected in parallel result in an equivalent combined resistance of two ohms. Electrical power equals the square of the voltage divided by the equivalent circuit resistance. Squaring twelve volts...
Q5. Three 47 Ω resistors are connected in parallel across a 110 V supply. Estimate the total current drawn_______________?
Show answer Hide answer
Answer: D. 7.06 A
Three forty seven ohm resistors in parallel yield an equivalent resistance of approximately fifteen point sixty seven ohms. Connecting this fifteen point sixty seven ohm equivalent resistance across a one hundred ten vol...
Q6. In an LC oscillator, quadrupling the inductance value alters the oscillation frequency by what factor__________?
Show answer Hide answer
Answer: D. Decreased 2 times
Oscillation frequency is inversely proportional to the square root of the circuit inductance value. Quadrupling the inductance value multiplies the internal radical expression by the square root of four. The square root...