Electricity

Front

What is resistance in electrical devices?

Back

Resistance is a measure of the opposition to the flow of electric current, often due to the presence of materials that protect delicate electronic components.

Front

How do you calculate current using Ohm's Law?

Back

Current (I) equals potential difference (V) divided by resistance (R). Formula: I = V/R.

Front

What is the unit of electrical power?

Back

The unit of electrical power is the watt (W).

Front

What is the formula to calculate energy consumption in kilowatt-hours (kWh)?

Back

Energy (kWh) = Power (kW) × Time (hours).

Front

What is the role of insulation in electrical wires?

Back

Insulation, such as plastic coating, prevents electrical shock and protects the wire from damage.

Tags

NGSS.MS-ETS1-2

Front

What is the relationship between voltage, current, and resistance?

Back

According to Ohm's Law, voltage (V) = current (I) × resistance (R).

Front

What does it mean for a material to be a good insulator?

Back

A good insulator is a material that does not allow electric current to flow easily, thus providing safety.

Front

How much current flows through a device that uses 1800 watts at 210 volts?

Back

Current (I) = Power (P) / Voltage (V) = 1800 W / 210 V = 8.57 A.

Front

What is the significance of a circuit breaker in electrical systems?

Back

A circuit breaker protects electrical circuits from overload by interrupting the flow of current.

Front

What is the difference between AC and DC current?

Back

AC (Alternating Current) changes direction periodically, while DC (Direct Current) flows in one direction.

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-3