Electricity - current

A lightening stroke lasts 0.05 seconds and involves a flow of 100 C. What is the current?

Electricity - charge

A calculator draws a current of 0.0001 A for 5 minutes. How much charge flows through it?

Electricity - current

The light bulb used in an overhead projector has a resistance of 24 Ohms. What is the current through the bulb when it is operating on 120V?

Electricity - power output

An electric eel can generate a 400-Volt, 0.5-A shock for stunning its prey. What is the eel's power output?

Electricity - energy

A clock consumes 2 W of electrical power. How much energy does it use each day?

Electromagnetism

The generator at a power plant produces AC at 24,000 Volts. A transformer steps this up to 345,000 Volts for transmission over power lines. If there are 2,000 turns of wire in the input coil of the transformer, how many turns must there be in the output coil. Please show the work. thanks

Electromagnetism

The wavelength of an electromagnetic wave is measured to be 600m. What is the frequency of the wave?

Electromagnetism

A piece of iron is heated with a torch to a temperature of 900K. How much more energy does it emit as blackbody radiation at 900K than it does at room temperature, 300K?

Optics

A ray of yellow light crosses the boundary between glass and air, going from the glass into the air. If the angle of incidence is 20 degrees, what is the angle of refraction?

Optics

When viewed through a magnifying glass, a stamp that is 2 cm wide appears upright and 6 cm wide. What is the magnification?