A toaster uses 1400 watts and takes 2.30 minutes to cook a piece of bread. If electricity costs
$0.16 / (kW•hr), then how many pieces of bread can be cooked for $0.05.

In an electric circuit,let’s say the switches are all closed and the EMF reads 10V,now the switch is opened somewhere in the circuit,will the EMF drop or will it always stay the same?And also with internal resistance,does it change if we add more resistors to the circuit?Does EMF or internal resistance change if we add more resistors or take out resistors?please show me different set ups and how they work?Thanks

State the electrical quantity that has the same value for each of two resistors connected to a battery
a) when they are in series
b) when they are in parallel

Calculate the energy released in joules from a 3v battery that operates a light bulb. The current flowing through the light bulb is 0.60 A and the bulb is left on for only 30s

I have a circuit with various resistors both in series and parallel. However, if a power of over 2.00W is dissipated in one of these resistors, that resistor will fail.
How can I work out the maximum voltage of the battery that can be used without any of the resistors failing.
All I am given is the resistances of the resistors in the circuit and power rating 2.00 W.

How can we use electric resistance in dentistry

Calculate the current flowing in resistor R1 (in mA) and calculate the power dissipated in the resistor. When voltage = 25V and Resistance=560 Ohms

An electric clothes dryer is rated at 3,200 W. How much energy does it use in 25 min?

12 volt battery consist of 6 cells connected in series. what is the internal resistance of a battery compared to each cell?
A. INTERNAL RESISTANCE BATTERY IS HIGH THAN RESISTANCE IN EACH CELL
B. INTERNAL RESISTANCE SAME EACH RESISTANCE
C. INTERNAL RESISTANCE IS LOWERTHAN RESISTANCE IN EACH CELL