Which is the correct statement of Ohm’s Law?
V = IR
CORRECT!
V = R/I
R = IV
I = R/V
Which statement regarding Ohm’s Law is correct?
If resistance is kept constant, potential difference changes directly with changes in current.
CORRECT!
An electrical conductor’s resistance depends on the potential difference it experiences.
When resistance increases in a circuit with a specific potential difference, then current must also increase.
Increasing the resistance in a circuit always decreases the potential difference across it.
When a current of 10.0 A flows through a 50.0-Ω resistor in a circuit, what is the voltage of that circuit?
500 V
CORRECT!
60 V
5 V
0.20 V
A 9-V battery is hooked up to a 3-Ω resistor. What current is flowing through this circuit?
3 A
CORRECT!!
27 A
0.3 A
12 A
Why does Ohm’s Law hold true only at a constant temperature?
As temperature increases, electrical resistance in most materials increases as well.
CORRECT!!
As temperature increases, the potential difference in most batteries increases as well.
As temperature increases, the potential difference in most batteries decreases.
As temperature increases, electrical resistance in most materials decreases.
Which statement regarding a short circuit is true?
A short circuit is an accidental low-resistance connection in a circuit.
CORRECT!!
A short circuit happens when the resistance in a circuit is too low.
A short circuit happens when a circuit is broken or interrupted.
A short circuit is dangerous because it creates a build-up of static charge.
Which word correctly completes this statement about electrical safety? “Some electronic devices, such as computer, retain some ______ even when they are unplugged, so you should not attempt to repair them yourself.”
charge
CORRECT!!
resistance
voltage
current
Which words correctly complete this statement about an electrical breaker?: Most home refrigerators are connected to a 30 _____ breaker in a breaker box, which will be triggered if excess _____ flows through the breaker.
Amp, current
CORRECT!!
Amp, voltage
Volt, current
Volt, voltage
Typical electrical fuses in a car protect the car’s wiring and electrical equipment. The number on each fuse indicates the current for which it is rated. Which statement about these electrical fuses is false?
Each fuse contains a high-resistance metal that prevents excess current across it.
CORRECT!
If the metal in a fuse melts, the current in that circuit is interrupted.
Each fuse contains a conductor that allows normal current to flow through it.
Each fuse contains a metal with a lower melting point than that of the circuit’s wires.
Which type of device is installed in bathrooms where electrical appliances are often used near a water source?
Residual current device
CORRECT!!
Circuit breaker
Fuse
Diode
[Quiz originally from here]