Engineering Board Exam Reviewer · Ohm's Law · medium
A heater element draws 5 A at 230 V. What resistance does it present?
- 0.02,
- 235,
- 92,
- 46,
Answer
D. 46,
Solution
R=V/I=230/5=46, .
More Ohm's Law questions
- What is the current through a 33 k resistor connected across a 9 V battery?
- A voltmeter reads 8.4 V across a resistor and an ammeter in series reads 42 mA. What is the resistance?
- A 12 V battery with internal resistance 0.4, is connected to a 5.6, load. What current flows?
- A battery of emf 12 V and internal resistance 0.5, delivers 2 A to a load. What is the terminal voltage?
- A resistor draws 20 mA at 6 V and 50 mA at 15 V. Find its resistance.
- The voltage across a resistor is tripled and, at the same time, its resistance is halved. By what factor does the current change?
- A 4.7 k resistor carries 2.5 mA. What is the voltage across it?
- In the circuit shown, the source is 36 V and the resistor is 9, . What does the ammeter read?
- In the circuit shown, the source is 12 V and the resistor is 4, . What does the ammeter read?
- For a fixed voltage, if the resistance in a circuit is halved, the current