Physics Answers

6.00 metres of a wire yields a resistance of 84.0 ȍ. If the resistivity of the wire is 4.30 × 10–7 ȍm, find the diameter of the wire. 

The potential difference across a component is 24 volts when the current through it is 0.40 amps. What is the resistance of the component?

An electron is accelerated to a speed of 4.23 × 10^6 ms –1 from rest by a potential difference. Calculate the potential difference

The power dissipated in a 6.0 V device is 3.0 watts. What current is flowing through the device?

A cell produces a steady current of 0.0044 A during its lifetime of 96 hours. Determine the maximum energy that this 1.5 V (terminal voltage) cell provides.  

312 C of charge passes through an electrical device in 143 seconds. If the potential difference across the device is 2.88 volts, determine the energy transfer to the device. 

The energy transfer to a device is 112 000 J when there is a potential difference of 185 volts across it. If the current through the device is 0.0644 A, how long in hours is the current flowing? 

The cross-sectional area of a wire containing 0.67 A is 4.9 × 10^–7 m^2 . If there are 8.5 × 10^28 charge carriers per m^3 in this wire, what is the drift speed of the charge carriers?  

2 842 C of charge passes through a circuit in 3.25 minutes. What is the current in the circuit?  

 How much charge passes through a wire in 2.5 minutes if the current in the wire is 1.6 A?