Shorts, opens, Series circuits, KVL - Unit test

What happens in a short circuit?

• Power consumption decreases

• Current flows in an unintended path

• Resistance increases to infinity

• Voltage decreases to zero

How can an open circuit be identified using an ohmmeter?

• The ohmmeter shows R=10 ohms

• The ohmmeter shows R=100 ohms

• The ohmmeter shows R=50 ohms

• The ohmmeter shows R = ∞

What are the dangers of a short circuit?

• No risk of damage to connected devices

• No risk of electrical shock

• Low current causing low temperatures

• High current causing high temperatures

What is an open circuit?

• A circuit with no path for current to flow

• A circuit with high resistance

• A circuit with low voltage

• A circuit with high power consumption

How can an open circuit be identified using an ohmmeter?

• If the ohmmeter shows R = 0.1 ohm

• If the ohmmeter shows R=50 ohms

• If the ohmmeter shows R = ∞

• If the ohmmeter shows R=100 ohms

Answer explanation

0.1 ohms is VERY CLOSE TO zero

What is continuity in electrical circuits?

• Presence of low voltage

• Presence of high resistance

• Absence of any path for current flow

• Presence of a complete path for current flow

What does a continuity test determine?

• If the circuit has high power consumption

• If the circuit has low resistance

• If a fuse is good or blown

• If the circuit has low voltage

When should continuity testing be attempted?

• When voltage is NOT present in the circuit being tested

• When voltage is present in the circuit being tested

• When the circuit is short-circuited

• When the circuit is overloaded

What should be done before attempting a continuity test?

• Increase the voltage in the circuit

• Increase the resistance in the circuit

• Connect more loads to the circuit

• Unplug the device or turn off the main circuit breaker

What is the purpose of the continuity testing circuit described in the text?

• To measure the power consumption in a circuit

• To test for any broken path between two points in a circuit

• To measure the voltage in a circuit

• To measure the resistance in a circuit