🔍 Key Concepts

• Megohm as a unit of measurement in electricity • Difference between measuring voltage, resistance, and capacitance • What electricians check to ensure wiring is safely insulated

💭 Think About

• Think about what part of an electrical system might require very high-value measurements, in the range of millions of ohms. • Ask yourself: when testing electric motors or cables for safety, what property are you most concerned about between the conductor and its outer casing? • Which of the options is typically associated with checking the condition of wire insulation rather than normal circuit operation?

✅ Before You Answer

• Recall that voltage is measured in volts with devices like voltmeters and multimeters. • Remember that capacitance is usually measured in farads with a capacitance meter, and power in watts with wattmeters or by calculation. • Match the word megohm to the electrical quantity whose unit is the ohm and is often used to assess the condition of insulation.