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Quiz 11.3 Ohm's Law
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Which is the correct statement of Ohm's Law?
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V = IR
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V = R/I
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R = IV
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I = R/V
Which statement regarding Ohm's Law is correct?
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If resistance is kept constant, potential difference changes directly with changes in current
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An electrical conductor's resistance depends on the potential difference it experiences
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When resistance increases in a circuit with a specific potential difference then current must also increase
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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?
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500 V
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5 V
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0.20 V
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60 V
A 9-V battery is hooked up to a 3-Ω resistor. What current is flowing through this circuit?
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3 A
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27 A
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0.3 A
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12 A
Why does Ohm's Law hold true only at a constant temperature?
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As temperature increases electrical resistance in most materials increases as well
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As temperature increases electrical resistance in most materials decreases
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As temperature increases the potential difference in most batteries increases as well
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As temperature increases the potential difference in most batteries decreases
Which statement regarding a short circuit is true?
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A short circuit is an accidental low-resistance connection in a circuit
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A short circuit happens when the resistance in a circuit is too low
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A short circuit happens when a circuit is broken or interrupted
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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 computers, retain some _____ even when they are unplugged, so you should not attempt to repair them yourself.
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charge
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voltage
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current
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resistance
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.
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Amp, current
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Volt, voltage
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Amp, voltage
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Volt, current
These are typical electrical fuses in a car, which 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?
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Each fuse contains a high-resistance metal that prevents excess current across it
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Each fuse contains a metal with a lower melting point than that of the circuit's wires
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If the metal in a fuse melts the current in that circuit is interrupted
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Each fuse contains a conductor that allows normal current to flow through it
Which type of device is installed in bathrooms where electrical appliances are often used near a water source?
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Residual current device
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Diode
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Fuse
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Circuit breaker
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