Study › Technician › T5D › T5D07

T5D07

ELECTRICAL PRINCIPLES · Ohm's Law; Series and parallel circuits

T5D07T5D →

What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?

  1. A9600 amperes
  2. B200 amperes
  3. C0.667 amperes
  4. D1.5 amperes
Why Ohm's Law solved for current is I = E / R, so divide the applied voltage by the resistance: 120 volts / 80 ohms = 1.5 amperes. The voltage pushes, the resistance opposes, so current is always the voltage divided by the resistance, never the product.
Watch out The 9600 ampere choice comes from multiplying 120 by 80, and 0.667 amperes is the division done upside down (80/120); keep voltage on top.
I = E/R: bigger voltage, more current; bigger resistance, less current. 120/80 = 1.5.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
← T5D06 All of T5D T5D08 →

The rest of T5D

  1. T5D01 What formula is used to calculate current in a circuit?
  2. T5D02 What formula is used to calculate voltage in a circuit?
  3. T5D03 What formula is used to calculate resistance in a circuit?
  4. T5D04 What is the resistance of a circuit in which a current of 3 amperes flows when connected to 90 volts?
  5. T5D05 What is the resistance of a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amp…
  6. T5D06 What is the resistance of a circuit that draws 4 amperes from a 12-volt source?
  7. T5D07 What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?
  8. T5D08 What is the current through a 100-ohm resistor connected across 200 volts?
  9. T5D09 What is the current through a 24-ohm resistor connected across 240 volts?
  10. T5D10 What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?
  11. T5D11 What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?
  12. T5D12 What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?
  13. T5D13 In which type of circuit is the current always the same through all components?
  14. T5D14 In which type of circuit is the voltage always the same across all components?
Nagoya NA-771 Dual Band Handheld AntennaSponsored · View on Amazon →Yaesu FT-65R VHF/UHF Dual Band HandheldSponsored · View on Amazon →